diff --git a/mozilla/nsprpub/pr/tests/dlltest.c b/mozilla/nsprpub/pr/tests/dlltest.c
index f8a5f53b8b2..82a2db5bb0a 100644
--- a/mozilla/nsprpub/pr/tests/dlltest.c
+++ b/mozilla/nsprpub/pr/tests/dlltest.c
@@ -98,7 +98,8 @@ int main(int argc, char** argv)
     PR_FreeLibraryName(libName);
     if (lib == NULL) {
         PRInt32 textLength = PR_GetErrorTextLength();
-        char *text = (char*)PR_MALLOC(textLength);
+        char *text = (char*)PR_MALLOC(textLength + 1);
+        text[0] = '\0';
         (void)PR_GetErrorText(text);
         fprintf(
             stderr, "PR_LoadLibrary failed (%d, %d, %s)\n",