diff --git a/lib/sanitizer_common/sanitizer_stacktrace.cc b/lib/sanitizer_common/sanitizer_stacktrace.cc
index 8ac78ae..e279a9f 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ b/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -20,8 +20,9 @@
 const char *StripPathPrefix(const char *filepath,
                             const char *strip_file_prefix) {
   if (filepath == 0) return 0;
-  if (filepath == internal_strstr(filepath, strip_file_prefix))
-    return filepath + internal_strlen(strip_file_prefix);
+  const char *prefix_beg = internal_strstr(filepath, strip_file_prefix);
+  if (prefix_beg)
+    return prefix_beg + internal_strlen(strip_file_prefix);
   return filepath;
 }