diff --git a/ext/libext.mak b/ext/libext.mak
index 42a0fbf..7b5c60c 100644
--- a/ext/libext.mak
+++ b/ext/libext.mak
@@ -14,6 +14,7 @@ BITSHUFFLE=1
 endif
 
 ifeq ($(CODEC1),1)
+CL=$(CXX)
 FASTPFOR=1
 MASKEDVBYTE=1
 SIMDCOMP=1