diff --git a/src/aclocal.m4 b/src/aclocal.m4
index 39774fe0e..d00bdad42 100644
--- a/src/aclocal.m4
+++ b/src/aclocal.m4
@@ -330,7 +330,7 @@ case "${host_os}" in
 		clibs='-ldl'
 		# We should use C99 and _XOPEN_SOURCE=600, but Solaris 10
 		# ships with GCC 3.4.3 which does not support C99
-                if test "x$GCC" = "yes"; then
+                if test "x$GCC" = "xyes"; then
                   CFLAGS="${CFLAGS} -std=gnu99"
                   SHARED_LDFLAGS="-shared $SHARED_LDFLAGS"
                   BUNDLE_LDFLAGS="-shared $BUNDLE_LDFLAGS"
diff --git a/src/configure b/src/configure
index 3c07a7f9b..d15c90f65 100755
--- a/src/configure
+++ b/src/configure
@@ -4837,7 +4837,7 @@ case "${host_os}" in
 		clibs='-ldl'
 		# We should use C99 and _XOPEN_SOURCE=600, but Solaris 10
 		# ships with GCC 3.4.3 which does not support C99
-                if test "x$GCC" = "yes"; then
+                if test "x$GCC" = "xyes"; then
                   CFLAGS="${CFLAGS} -std=gnu99"
                   SHARED_LDFLAGS="-shared $SHARED_LDFLAGS"
                   BUNDLE_LDFLAGS="-shared $BUNDLE_LDFLAGS"