diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 225ab3287..7298419d9 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -12,7 +12,9 @@
 
 
 %{
+#ifdef __clang__
 #pragma clang diagnostic ignored "-Wunneeded-internal-declaration"
+#endif
 
 #include <boost/lexical_cast.hpp>