diff --git a/mingw-w64-headers/crt/float.h b/mingw-w64-headers/crt/float.h
index 429df3b..492a3c0 100644
--- a/mingw-w64-headers/crt/float.h
+++ b/mingw-w64-headers/crt/float.h
@@ -16,7 +16,7 @@
 #ifndef _FLOAT_H___
 #include_next <float.h>
 #endif
-#elif !defined (_FLOAT_H__)
+#elif !defined (_FLOAT_H___)
 #error Corrupt install of gcc's internal headers, or search order was changed.
 #endif
 #endif