diff --git a/build/pcre.m4 b/build/pcre.m4
index 5c3ea989..de28e8b8 100644
--- a/build/pcre.m4
+++ b/build/pcre.m4
@@ -106,7 +106,7 @@ else
         LIBS=$save_LIBS
     fi
 
-    PCRE_CFLAGS="-DWITH_PCRE$ {PCRE_CFLAGS}"
+    PCRE_CFLAGS="-DWITH_PCRE ${PCRE_CFLAGS}"
     AC_SUBST(PCRE_CONFIG)
     AC_SUBST(PCRE_VERSION)
     AC_SUBST(PCRE_CPPFLAGS)