diff --git a/cmd-display-menu.c b/cmd-display-menu.c
index 5df01c7a..87871f68 100644
--- a/cmd-display-menu.c
+++ b/cmd-display-menu.c
@@ -53,10 +53,10 @@ const struct cmd_entry cmd_display_popup_entry = {
 	.name = "display-popup",
 	.alias = "popup",
 
-	.args = { "BCc:d:Eh:t:w:x:y:", 0, -1, NULL },
-	.usage = "[-BCE] [-c target-client] [-d start-directory] [-h height] "
-		 CMD_TARGET_PANE_USAGE " [-w width] "
-		 "[-x position] [-y position] [shell-command]",
+	.args = { "BCc:d:e:Eh:t:w:x:y:", 0, -1, NULL },
+	.usage = "[-BCE] [-c target-client] [-d start-directory] "
+		 "[-e environment] [-h height] " CMD_TARGET_PANE_USAGE " "
+		 "[-w width] [-x position] [-y position] [shell-command]",
 
 	.target = { 't', CMD_FIND_PANE, 0 },
 
@@ -357,6 +357,8 @@ cmd_display_popup_exec(struct cmd *self, struct cmdq_item *item)
 	char			*cwd, *cause, **argv = NULL;
 	int			 flags = 0, argc = 0;
 	u_int			 px, py, w, h, count = args_count(args);
+	struct args_value	*av;
+	struct environ		*env = NULL;
 
 	if (args_has(args, 'C')) {
 		server_client_clear_overlay(tc);
@@ -410,17 +412,30 @@ cmd_display_popup_exec(struct cmd *self, struct cmdq_item *item)
 	} else
 		args_to_vector(args, &argc, &argv);
 
+	if (args_has(args, 'e') >= 1) {
+		env = environ_create();
+		av = args_first_value(args, 'e');
+		while (av != NULL) {
+			environ_put(env, av->string, 0);
+			av = args_next_value(av);
+		}
+	}
+
 	if (args_has(args, 'E') > 1)
 		flags |= POPUP_CLOSEEXITZERO;
 	else if (args_has(args, 'E'))
 		flags |= POPUP_CLOSEEXIT;
 	if (args_has(args, 'B'))
 		flags |= POPUP_NOBORDER;
-	if (popup_display(flags, item, px, py, w, h, shellcmd, argc, argv, cwd,
-	    tc, s, NULL, NULL) != 0) {
+	if (popup_display(flags, item, px, py, w, h, env, shellcmd, argc, argv,
+	    cwd, tc, s, NULL, NULL) != 0) {
 		cmd_free_argv(argc, argv);
+		if (env != NULL)
+			environ_free(env);
 		return (CMD_RETURN_NORMAL);
 	}
+	if (env != NULL)
+		environ_free(env);
 	cmd_free_argv(argc, argv);
 	return (CMD_RETURN_WAIT);
 }
diff --git a/cmd-if-shell.c b/cmd-if-shell.c
index 211e08d6..205a8ce1 100644
--- a/cmd-if-shell.c
+++ b/cmd-if-shell.c
@@ -118,7 +118,7 @@ cmd_if_shell_exec(struct cmd *self, struct cmdq_item *item)
 	if (cdata->client != NULL)
 		cdata->client->references++;
 
-	if (job_run(shellcmd, 0, NULL, s,
+	if (job_run(shellcmd, 0, NULL, NULL, s,
 	    server_client_get_cwd(cmdq_get_client(item), s), NULL,
 	    cmd_if_shell_callback, cmd_if_shell_free, cdata, 0, -1,
 	    -1) == NULL) {
diff --git a/cmd-run-shell.c b/cmd-run-shell.c
index bf43d313..5e914e65 100644
--- a/cmd-run-shell.c
+++ b/cmd-run-shell.c
@@ -188,7 +188,7 @@ cmd_run_shell_timer(__unused int fd, __unused short events, void* arg)
 			cmd_run_shell_free(cdata);
 			return;
 		}
-		if (job_run(cmd, 0, NULL, cdata->s, cdata->cwd, NULL,
+		if (job_run(cmd, 0, NULL, NULL, cdata->s, cdata->cwd, NULL,
 		    cmd_run_shell_callback, cmd_run_shell_free, cdata,
 		    cdata->flags, -1, -1) == NULL)
 			cmd_run_shell_free(cdata);
diff --git a/format.c b/format.c
index 37b9123b..f5d2c5f6 100644
--- a/format.c
+++ b/format.c
@@ -390,7 +390,7 @@ format_job_get(struct format_expand_state *es, const char *cmd)
 	if (force && fj->job != NULL)
 	       job_free(fj->job);
 	if (force || (fj->job == NULL && fj->last != t)) {
-		fj->job = job_run(expanded, 0, NULL, NULL,
+		fj->job = job_run(expanded, 0, NULL, NULL, NULL,
 		    server_client_get_cwd(ft->client, NULL), format_job_update,
 		    format_job_complete, NULL, fj, JOB_NOWAIT, -1, -1);
 		if (fj->job == NULL) {
diff --git a/job.c b/job.c
index 66a25557..4c13f943 100644
--- a/job.c
+++ b/job.c
@@ -71,7 +71,7 @@ static LIST_HEAD(joblist, job) all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
 
 /* Start a job running. */
 struct job *
-job_run(const char *cmd, int argc, char **argv, struct session *s,
+job_run(const char *cmd, int argc, char **argv, struct environ *e, struct session *s,
     const char *cwd, job_update_cb updatecb, job_complete_cb completecb,
     job_free_cb freecb, void *data, int flags, int sx, int sy)
 {
@@ -89,6 +89,9 @@ job_run(const char *cmd, int argc, char **argv, struct session *s,
 	 * if-shell to decide on default-terminal based on outside TERM.
 	 */
 	env = environ_for_session(s, !cfg_finished);
+	if (e != NULL) {
+		environ_copy(e, env);
+	}
 
 	sigfillset(&set);
 	sigprocmask(SIG_BLOCK, &set, &oldset);
diff --git a/popup.c b/popup.c
index d4fc3833..635559fa 100644
--- a/popup.c
+++ b/popup.c
@@ -590,8 +590,9 @@ popup_job_complete_cb(struct job *job)
 
 int
 popup_display(int flags, struct cmdq_item *item, u_int px, u_int py, u_int sx,
-    u_int sy, const char *shellcmd, int argc, char **argv, const char *cwd,
-    struct client *c, struct session *s, popup_close_cb cb, void *arg)
+    u_int sy, struct environ *env, const char *shellcmd, int argc, char **argv,
+    const char *cwd, struct client *c, struct session *s, popup_close_cb cb,
+    void *arg)
 {
 	struct popup_data	*pd;
 	u_int			 jx, jy;
@@ -635,7 +636,7 @@ popup_display(int flags, struct cmdq_item *item, u_int px, u_int py, u_int sx,
 	pd->psx = sx;
 	pd->psy = sy;
 
-	pd->job = job_run(shellcmd, argc, argv, s, cwd,
+	pd->job = job_run(shellcmd, argc, argv, env, s, cwd,
 	    popup_job_update_cb, popup_job_complete_cb, NULL, pd,
 	    JOB_NOWAIT|JOB_PTY|JOB_KEEPWRITE, jx, jy);
 	pd->ictx = input_init(NULL, job_get_event(pd->job), &pd->palette);
@@ -725,7 +726,7 @@ popup_editor(struct client *c, const char *buf, size_t len,
 
 	xasprintf(&cmd, "%s %s", editor, path);
 	if (popup_display(POPUP_INTERNAL|POPUP_CLOSEEXIT, NULL, px, py, sx, sy,
-	    cmd, 0, NULL, _PATH_TMP, c, NULL, popup_editor_close_cb, pe) != 0) {
+	    NULL, cmd, 0, NULL, _PATH_TMP, c, NULL, popup_editor_close_cb, pe) != 0) {
 		popup_editor_free(pe);
 		free(cmd);
 		return (-1);
diff --git a/tmux.1 b/tmux.1
index 027db664..14556ba3 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5753,6 +5753,7 @@ forwards any input read from stdin to the empty pane given by
 .Op Fl BCE
 .Op Fl c Ar target-client
 .Op Fl d Ar start-directory
+.Op Fl e Ar environment
 .Op Fl h Ar height
 .Op Fl t Ar target-pane
 .Op Fl w Ar width
@@ -5793,6 +5794,12 @@ If omitted, half of the terminal size is used.
 .Fl B
 does not surround the popup by a border.
 .Pp
+.Fl e
+takes the form
+.Ql VARIABLE=value
+and sets an environment variable for the popup; it may be specified multiple
+times.
+.Pp
 The
 .Fl C
 flag closes any popup on the client.
diff --git a/tmux.h b/tmux.h
index 29a532aa..57d3c909 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2073,9 +2073,9 @@ typedef void (*job_free_cb) (void *);
 #define JOB_NOWAIT 0x1
 #define JOB_KEEPWRITE 0x2
 #define JOB_PTY 0x4
-struct job	*job_run(const char *, int, char **, struct session *,
-		     const char *, job_update_cb, job_complete_cb, job_free_cb,
-		     void *, int, int, int);
+struct job	*job_run(const char *, int, char **, struct environ *,
+		     struct session *, const char *, job_update_cb,
+		     job_complete_cb, job_free_cb, void *, int, int, int);
 void		 job_free(struct job *);
 int		 job_transfer(struct job *, pid_t *, char *, size_t);
 void		 job_resize(struct job *, u_int, u_int);
@@ -3105,8 +3105,9 @@ int		 menu_key_cb(struct client *, void *, struct key_event *);
 typedef void (*popup_close_cb)(int, void *);
 typedef void (*popup_finish_edit_cb)(char *, size_t, void *);
 int		 popup_display(int, struct cmdq_item *, u_int, u_int, u_int,
-		    u_int, const char *, int, char **, const char *,
-		    struct client *, struct session *, popup_close_cb, void *);
+		    u_int, struct environ *, const char *, int, char **,
+		    const char *, struct client *, struct session *,
+		    popup_close_cb, void *);
 int		 popup_editor(struct client *, const char *, size_t,
 		    popup_finish_edit_cb, void *);
 
diff --git a/window-copy.c b/window-copy.c
index c1a31b48..ec6a2f4e 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -4531,8 +4531,8 @@ window_copy_pipe_run(struct window_mode_entry *wme, struct session *s,
 	if (cmd == NULL || *cmd == '\0')
 		cmd = options_get_string(global_options, "copy-command");
 	if (cmd != NULL && *cmd != '\0') {
-		job = job_run(cmd, 0, NULL, s, NULL, NULL, NULL, NULL, NULL,
-		    JOB_NOWAIT, -1, -1);
+		job = job_run(cmd, 0, NULL, NULL, s, NULL, NULL, NULL, NULL,
+		    NULL, JOB_NOWAIT, -1, -1);
 		bufferevent_write(job_get_event(job), buf, *len);
 	}
 	return (buf);