diff --git a/make/linux-rpm-build.mk b/make/linux-rpm-build.mk
index 782a2923..9ac86320 100644
--- a/make/linux-rpm-build.mk
+++ b/make/linux-rpm-build.mk
@@ -72,7 +72,7 @@ BUILD = sh $(MODDIR)/devutil/jcs/build_linux.sh \
 		-a i386 \
 		-s $(KERNEL_SRC_DIR) \
 		-i $(TMP_INSTALL)
-MKSPEC := $(shell which mkspec-linux.sh)
+MKSPEC := $(MODDIR)/devutil/jcs/mkspec-linux.sh
 
 # exports
 export KERNEL_VERSION