diff --git a/src/Makefile b/src/Makefile
index d1423fd..fb62aff 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -5,7 +5,6 @@
 # ...with changes in the jumbo patch, by various authors
 #
 
-CC = gcc
 AS = $(CC)
 LD = $(CC)
 CPP = $(CC)
@@ -426,9 +425,9 @@ linux-x86-64-clang-debug:
 	@echo "#define JOHN_BLD" '"'$@'"' > john_build_rule.h
 	$(MAKE) $(PROJ) \
 		JOHN_OBJS="$(JOHN_OBJS) c3_fmt.o x86-64.o sse-intrinsics.o" \
-		CFLAGS="-Wall -Wdeclaration-after-statement -c -g -O1 -faddress-sanitizer -I/usr/include -msse2 -DHAVE_CRYPT -DHAVE_DL $(HAVE_NSS) $(HAVE_GMP) $(HAVE_KRB5) $(JOHN_CFLAGS)" \
+		CFLAGS="-Wall -Wdeclaration-after-statement -c -g -I/usr/include -msse2 -DHAVE_CRYPT -DHAVE_DL $(HAVE_NSS) $(HAVE_GMP) $(HAVE_KRB5) $(JOHN_CFLAGS)" \
 		LDFLAGS="-L/usr/local/lib -L/usr/local/ssl/lib -lssl -lcrypto -lm -lz -lcrypt -ldl -faddress-sanitizer $(NSS_LDFLAGS) $(GMP_LDFLAGS) $(KRB5_LDFLAGS)" \
-		CPP="clang" CC="clang" AS="clang" LD="clang"
+		CPP="clang" AS="clang" LD="clang"
 
 linux-x86-64-icc:
 	$(LN) x86-64.h arch.h