--- a/js/src/jsnum.cpp
+++ b/js/src/jsnum.cpp
@@ -1120,7 +1120,7 @@
 void
 js::FIX_FPU()
 {
-#if (defined __GNUC__ && defined __i386__) || \
+#if (defined __GLIBC__ && defined __i386__) || \
     (defined __SUNPRO_CC && defined __i386)
     short control;
     asm("fstcw %0" : "=m" (control) : );