diff --git a/js/src/fdlibm/fdlibm.h b/js/src/fdlibm/fdlibm.h
index 9f42b2d33a6..3049030b3fe 100644
--- a/js/src/fdlibm/fdlibm.h
+++ b/js/src/fdlibm/fdlibm.h
@@ -67,7 +67,7 @@
 
 /* End here. The rest is the standard file. */
 
-#ifdef __NEWVALID	/* special setup for Sun test regime */
+#ifdef SOLARIS	/* special setup for Sun test regime */
 #if defined(i386) || defined(i486) || \
 	defined(intel) || defined(x86) || defined(i86pc)
 #define __LITTLE_ENDIAN