diff --git a/make/linux-rpm-build.mk b/make/linux-rpm-build.mk
index 534bbf57..6e952dde 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 := sh $(MODDIR)/devutil/jcs/mkspec-linux.sh
+MKSPEC := $(MODDIR)/devutil/jcs/mkspec-linux.sh
 
 # exports
 export KERNEL_VERSION
@@ -87,7 +87,7 @@ all: rpm
 	touch $@
 
 $(TMP_INSTALL)/$(F_SPEC): linux-$(KERNEL_VERSION)/Makefile $(MKSPEC) Makefile
-	$(MKSPEC) -d $(TMP_INSTALL) -b $(KERNEL_BASE) -v $(KERNEL_VERSION) -r $(RPM_RELEASE) -a $(ARCH) -l $(BOOT_LABEL) > $@
+	sh $(MKSPEC) -d $(TMP_INSTALL) -b $(KERNEL_BASE) -v $(KERNEL_VERSION) -r $(RPM_RELEASE) -a $(ARCH) -l $(BOOT_LABEL) > $@
 
 $(TMP_INSTALL)/boot/%-$(KERNEL_VERSION)-$(RPM_RELEASE): build.lxdone $(LOCAL_AFTER_KERNEL_BUILD)
 	@echo -n