diff --git a/src/auto/configure b/src/auto/configure
index 8582298..70ebb33 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -10136,9 +10136,12 @@
 tmp_version = g_strdup("$min_gtk_version");
 if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    printf("%s, bad version string\n", "$min_gtk_version");
+   g_free(tmp_version);
    exit(1);
  }
 
+g_free(tmp_version);
+
 if ((gtk_major_version > major) ||
     ((gtk_major_version == major) && (gtk_minor_version > minor)) ||
     ((gtk_major_version == major) && (gtk_minor_version == minor) &&