diff --git a/utils/TableGen/FileLexer.cpp.cvs b/utils/TableGen/FileLexer.cpp.cvs
index f7f374c61cc..aaa5237ce43 100644
--- a/utils/TableGen/FileLexer.cpp.cvs
+++ b/utils/TableGen/FileLexer.cpp.cvs
@@ -609,7 +609,7 @@ static void HandleInclude(const char *Buffer) {
     std::string NextFilename;
     for (unsigned i = 0, e = IncludeDirectories.size(); i != e; ++i) {
       NextFilename = IncludeDirectories[i] + "/" + Filename;
-      if (yyin = fopen(NextFilename.c_str(), "r"))
+      if ((yyin = fopen(NextFilename.c_str(), "r")))
         break;
     }
     
diff --git a/utils/TableGen/FileLexer.l b/utils/TableGen/FileLexer.l
index c561ec64c67..020a356b0b4 100644
--- a/utils/TableGen/FileLexer.l
+++ b/utils/TableGen/FileLexer.l
@@ -128,7 +128,7 @@ static void HandleInclude(const char *Buffer) {
     std::string NextFilename;
     for (unsigned i = 0, e = IncludeDirectories.size(); i != e; ++i) {
       NextFilename = IncludeDirectories[i] + "/" + Filename;
-      if (yyin = fopen(NextFilename.c_str(), "r"))
+      if ((yyin = fopen(NextFilename.c_str(), "r")))
         break;
     }
     
diff --git a/utils/TableGen/FileLexer.l.cvs b/utils/TableGen/FileLexer.l.cvs
index c561ec64c67..020a356b0b4 100644
--- a/utils/TableGen/FileLexer.l.cvs
+++ b/utils/TableGen/FileLexer.l.cvs
@@ -128,7 +128,7 @@ static void HandleInclude(const char *Buffer) {
     std::string NextFilename;
     for (unsigned i = 0, e = IncludeDirectories.size(); i != e; ++i) {
       NextFilename = IncludeDirectories[i] + "/" + Filename;
-      if (yyin = fopen(NextFilename.c_str(), "r"))
+      if ((yyin = fopen(NextFilename.c_str(), "r")))
         break;
     }