--- a/config.mk
+++ b/config.mk
@@ -20,16 +20,16 @@ COMPAT_LATEST_VERSION = 1
 KERNEL_VERSION := $(shell $(MAKE) -C $(KLIB_BUILD) kernelversion | sed -n 's/^\([0-9]\)\..*/\1/p')
 
 ifneq ($(KERNEL_VERSION),2)
-KERNEL_SUBLEVEL := $(shell $(MAKE) -C $(KLIB_BUILD) kernelversion | sed -n 's/^3\.\([0-9]\+\).*/\1/p')
+COMPAT_KERNEL_SUBLEVEL := $(shell $(MAKE) -C $(KLIB_BUILD) kernelversion | sed -n 's/^3\.\([0-9]\+\).*/\1/p')
 else
 COMPAT_26LATEST_VERSION = 39
 KERNEL_26SUBLEVEL := $(shell $(MAKE) -C $(KLIB_BUILD) kernelversion | sed -n 's/^2\.6\.\([0-9]\+\).*/\1/p')
 COMPAT_26VERSIONS := $(shell I=$(COMPAT_26LATEST_VERSION); while [ "$$I" -gt $(KERNEL_26SUBLEVEL) ]; do echo $$I; I=$$(($$I - 1)); done)
 $(foreach ver,$(COMPAT_26VERSIONS),$(eval CONFIG_COMPAT_KERNEL_2_6_$(ver)=y))
-KERNEL_SUBLEVEL := -1
+COMPAT_KERNEL_SUBLEVEL := -1
 endif
 
-COMPAT_VERSIONS := $(shell I=$(COMPAT_LATEST_VERSION); while [ "$$I" -gt $(KERNEL_SUBLEVEL) ]; do echo $$I; I=$$(($$I - 1)); done)
+COMPAT_VERSIONS := $(shell I=$(COMPAT_LATEST_VERSION); while [ "$$I" -gt $(COMPAT_KERNEL_SUBLEVEL) ]; do echo $$I; I=$$(($$I - 1)); done)
 $(foreach ver,$(COMPAT_VERSIONS),$(eval CONFIG_COMPAT_KERNEL_3_$(ver)=y))
 
 ifdef CONFIG_COMPAT_KERNEL_2_6_24
