diff --git a/src/nmcli/devices.c b/src/nmcli/devices.c
index 31e7d8be4d..4c9e7d9f4e 100644
--- a/src/nmcli/devices.c
+++ b/src/nmcli/devices.c
@@ -4107,7 +4107,7 @@ generate_wpa_key(char *key, size_t len)
         do {
             c = nm_random_u64_range_full(33, 126, TRUE);
             /* too many non alphanumeric characters are hard to remember for humans */
-        } while (g_ascii_isalnum(c));
+        } while (!g_ascii_isalnum(c));
 
         key[i] = (char) c;
     }