diff --git a/Makefile.config b/Makefile.config
index 7014be94..7a4c7e58 100644
--- a/Makefile.config
+++ b/Makefile.config
@@ -22,8 +22,8 @@ LIBS += -ldl
 endif
 
 # Compiler options
-CFLAGS       ?= $(CYC_PROFILING) $(CYC_GCC_OPT_FLAGS) -fPIC -Wall -Iinclude
-BASE_CFLAGS  ?= $(CYC_PROFILING) $(CYC_GCC_OPT_FLAGS) -fPIC -Wall -I$(PREFIX)/include
+CFLAGS       ?= $(CYC_PROFILING) $(CYC_GCC_OPT_FLAGS) -fPIC -Wall -Wno-shift-negative-value -Iinclude
+BASE_CFLAGS  ?= $(CYC_PROFILING) $(CYC_GCC_OPT_FLAGS) -fPIC -Wall -Wno-shift-negative-value -I$(PREFIX)/include
 # Used by Cyclone to compile programs, no need for PIC there
 BASE_PROG_CFLAGS  ?= $(CYC_PROFILING) $(CYC_GCC_OPT_FLAGS) -Wall -I$(PREFIX)/include
 ifeq ($(OS),Darwin)