diff --git a/auto/lib/perl/make b/auto/lib/perl/make
index 9c5e826..260bd95 100644
--- a/auto/lib/perl/make
+++ b/auto/lib/perl/make
@@ -31,7 +31,7 @@
 
 	cd $NGX_OBJS/src/http/modules/perl \\
 		&& NGX_PM_CFLAGS="\$(NGX_PM_CFLAGS) -g $NGX_CC_OPT" \\
-			NGX_INCS="\$(CORE_INCS) \$(HTTP_INCS)" \\
+			NGX_INCS="$CORE_INCS $NGX_OBJS $HTTP_INCS" \\
 			NGX_DEPS="\$(CORE_DEPS) \$(HTTP_DEPS)" \\
 		$NGX_PERL Makefile.PL \\
 			LIB=$NGX_PERL_MODULES \\