diff --git a/configure.in b/configure.in
index eacabb821..18a530fb9 100755
--- a/configure.in
+++ b/configure.in
@@ -263,7 +263,7 @@ if test "x${OS_IS_CYGWIN}" = "x1"; then
   AC_DEFINE_UNQUOTED(CYGWIN,$OS_IS_CYGWIN)
 fi
 if test "x${OS_IS_SOLARIS}" = "x1"; then
-  AC_DEFINE_UNQUOTED(CYGWIN,$OS_IS_SOLARIS)
+  AC_DEFINE_UNQUOTED(SOLARIS,$OS_IS_SOLARIS)
 fi
 if test "x${OS_IS_WIN}" = "x1"; then
   AC_DEFINE_UNQUOTED(WINMSVC,$OS_IS_WIN)