diff --git a/Makefile b/Makefile
index f463e72..55298a0 100644
--- a/Makefile
+++ b/Makefile
@@ -87,11 +87,13 @@ kernloader64: loader64
 
 
 libumagnus: cl-compiler
+	rm -f ./libumagnus/*.cc
 	uMagNUS-clCompiler -args="-cl-finite-math-only -cl-no-signed-zeros -cl-fp32-correctly-rounded-divide-sqrt -cl-kernel-arg-info" -std="CL1.2" -iopts="-I$(PWD)/kernels_src" -dump $(PWD)/kernels_src/Kernels/kernels32.h >> libumagnus/libumagnus.cc
 	$(MAKE) -C ./libumagnus lib
 
 
 libumagnus64: cl-compiler
+	rm -f ./libumagnus/*.cc
 	uMagNUS-clCompiler -args="-cl-finite-math-only -cl-no-signed-zeros -cl-fp32-correctly-rounded-divide-sqrt -cl-kernel-arg-info -D__REAL_IS_DOUBLE__" -std="CL1.2" -iopts="-I$(PWD)/kernels_src" -dump $(PWD)/kernels_src/Kernels/kernels64.h >> libumagnus/libumagnus64.cc
 	$(MAKE) -C ./libumagnus lib64