diff --git a/src/processor/basic_source_line_resolver.cc b/src/processor/basic_source_line_resolver.cc
index d0855a30..aa66e159 100644
--- a/src/processor/basic_source_line_resolver.cc
+++ b/src/processor/basic_source_line_resolver.cc
@@ -483,7 +483,7 @@ bool SymbolParseHelper::ParseFile(char *file_line, long *index,
   }
 
   *filename = tokens[1];
-  if (!filename) {
+  if (!*filename) {
     return false;
   }