diff --git a/src/template/solaris b/src/template/solaris
index e6ee10f560bd29370abef565895c5fbace3733f0..785fc3ea130c5753e5371088d5d10e691edbf7d9 100644
--- a/src/template/solaris
+++ b/src/template/solaris
@@ -1,6 +1,6 @@
 if test "$GCC" != yes ; then
   CC="$CC -Xa"			# relaxed ISO C mode
-  CFLAGS="-v"			# -v is like gcc -Wall
+  CFLAGS="-v -DSUNOS4_CC"	# -v is like gcc -Wall
   if test "$enable_debug" != yes; then
     CFLAGS="$CFLAGS -O"		# any optimization breaks debug
   fi