diff --git a/glfw/input.c b/glfw/input.c
index 92d575502..8eb696c68 100644
--- a/glfw/input.c
+++ b/glfw/input.c
@@ -421,15 +421,22 @@ size_t _glfwInputDropEvent(_GLFWwindow *window, GLFWDropEventType type, double x
         size_t write_pos = 0;
         for (size_t i = 0; i < num_mimes; i++) {
             if (mime_dedup_set_is_end(mime_dedup_set_get(&seen, mimes[i]))) {
-                if (!mime_dedup_set_is_end(mime_dedup_set_insert(&seen, mimes[i])))
-                    mimes[write_pos++] = mimes[i];
-                else {
-                    // OOM: keep remaining entries without further deduplication
-                    mimes[write_pos++] = mimes[i];
-                    for (size_t j = i + 1; j < num_mimes; j++) mimes[write_pos++] = mimes[j];
+                if (mime_dedup_set_is_end(mime_dedup_set_insert(&seen, mimes[i]))) {
+                    // OOM: shift remaining entries to write_pos and stop deduplicating
+                    memmove(mimes + write_pos, mimes + i, (num_mimes - i) * sizeof(const char*));
+                    write_pos += num_mimes - i;
                     break;
                 }
+                // Swap the unique entry into write_pos; the displaced entry moves to
+                // position i where it will end up at or beyond the new num_mimes.
+                if (write_pos != i) {
+                    const char *tmp = mimes[write_pos];
+                    mimes[write_pos] = mimes[i];
+                    mimes[i] = tmp;
+                }
+                write_pos++;
             }
+            // duplicate: left in-place; will end up at a position >= new num_mimes
         }
         num_mimes = write_pos;
         mime_dedup_set_cleanup(&seen);