diff --git a/nsprpub/lib/tests/string.c b/nsprpub/lib/tests/string.c
index f30deb4d10d..be3dc2197d7 100644
--- a/nsprpub/lib/tests/string.c
+++ b/nsprpub/lib/tests/string.c
@@ -459,8 +459,8 @@ PRBool test_006(void)
                 b++;
             }
 
-            free(rv);
         }
+        PL_strfree(rv);
     }
 
     printf("PASS\n");