diff --git a/src/compiler/glsl/ir_print_glsl_visitor.cpp b/src/compiler/glsl/ir_print_glsl_visitor.cpp
index bdd512f1ddf..b5b03b8b17d 100644
--- a/src/compiler/glsl/ir_print_glsl_visitor.cpp
+++ b/src/compiler/glsl/ir_print_glsl_visitor.cpp
@@ -1462,7 +1462,7 @@ void print_float (string_buffer& buffer, float f)
 		strcpy(tmp, "(-1.0/0.0)");
 	
 	// Do similar thing for NaN
-	if (f != f)
+	if (isnan(f))
 		strcpy(tmp, "(0.0/0.0)");
 
 	#if _MSC_VER