diff --git a/cmd-send-keys.c b/cmd-send-keys.c
index a7c5ee10..ac99a6fd 100644
--- a/cmd-send-keys.c
+++ b/cmd-send-keys.c
@@ -74,7 +74,7 @@ cmd_send_keys_inject_key(struct cmdq_item *item, struct cmdq_item *after,
 		if (tc == NULL)
 			return (item);
 		event = xmalloc(sizeof *event);
-		event->key = key;
+		event->key = key|KEYC_SENT;
 		memset(&event->m, 0, sizeof event->m);
 		if (server_client_handle_key(tc, event) == 0)
 			free(event);
diff --git a/key-string.c b/key-string.c
index 086c3ac4..699d460f 100644
--- a/key-string.c
+++ b/key-string.c
@@ -462,6 +462,8 @@ out:
 			strlcat(out, "B", sizeof out);
 		if (saved & KEYC_EXTENDED)
 			strlcat(out, "E", sizeof out);
+		if (saved & KEYC_SENT)
+			strlcat(out, "S", sizeof out);
 		strlcat(out, "]", sizeof out);
 	}
 	return (out);
diff --git a/server-client.c b/server-client.c
index 5bb7d878..f591bce8 100644
--- a/server-client.c
+++ b/server-client.c
@@ -1887,7 +1887,9 @@ server_client_key_callback(struct cmdq_item *item, void *data)
 		goto forward_key;
 
 	/* Treat everything as a regular key when pasting is detected. */
-	if (!KEYC_IS_MOUSE(key) && server_client_assume_paste(s))
+	if (!KEYC_IS_MOUSE(key) &&
+	    (~key & KEYC_SENT) &&
+	    server_client_assume_paste(s))
 		goto forward_key;
 
 	/*
diff --git a/tmux.h b/tmux.h
index 04818fc8..443b2ee3 100644
--- a/tmux.h
+++ b/tmux.h
@@ -132,13 +132,14 @@ struct winlink;
 #define KEYC_SHIFT           0x00400000000000ULL
 
 /* Key flag bits. */
-#define KEYC_LITERAL         0x01000000000000ULL
-#define KEYC_KEYPAD          0x02000000000000ULL
-#define KEYC_CURSOR          0x04000000000000ULL
+#define KEYC_LITERAL	     0x01000000000000ULL
+#define KEYC_KEYPAD	     0x02000000000000ULL
+#define KEYC_CURSOR	     0x04000000000000ULL
 #define KEYC_IMPLIED_META    0x08000000000000ULL
 #define KEYC_BUILD_MODIFIERS 0x10000000000000ULL
-#define KEYC_VI              0x20000000000000ULL
-#define KEYC_EXTENDED        0x40000000000000ULL
+#define KEYC_VI		     0x20000000000000ULL
+#define KEYC_EXTENDED	     0x40000000000000ULL
+#define KEYC_SENT	     0x80000000000000ULL
 
 /* Masks for key bits. */
 #define KEYC_MASK_MODIFIERS  0x00f00000000000ULL