diff --git a/apache2/Makefile.am b/apache2/Makefile.am
index 678e84c1..273bed5e 100644
--- a/apache2/Makefile.am
+++ b/apache2/Makefile.am
@@ -14,7 +14,7 @@ mod_security2_la_SOURCES = mod_security2.c \
                            msc_geo.c msc_gsb.c msc_unicode.c acmp.c msc_lua.c msc_release.c
 
 mod_security2_la_CFLAGS = @APXS_CFLAGS@ @APR_CFLAGS@ @APU_CFLAGS@ \
-                          @PCRE_CFLAGS@ @LIBXML2_CFLAGS@ @LUA_CFLAGS@ @MODSEC_EXTRA_CFLAGS@
+                          @PCRE_CFLAGS@ @LIBXML2_CFLAGS@ @LUA_CFLAGS@ @MODSEC_EXTRA_CFLAGS@ @CURL_CFLAGS@
 mod_security2_la_CPPFLAGS = @APR_CPPFLAGS@ @PCRE_CPPFLAGS@ @LIBXML2_CPPFLAGS@
 mod_security2_la_LIBADD = @APR_LDADD@ @APU_LDADD@ @PCRE_LDADD@ @LIBXML2_LDADD@ @LUA_LDADD@