diff --git a/libmapper/Makefile b/libmapper/Makefile
index 2f71515..128a032 100644
--- a/libmapper/Makefile
+++ b/libmapper/Makefile
@@ -10,7 +10,8 @@
 INCLUDES=mapper.h
 
 LDLIBS+=$(shell pkg-config --libs $(PACKAGE_DEPS))
-ALL_CFLAGS+=$(shell pkg-config --cflags $(PACKAGE_DEPS)) -fPIC -Werror $(CFLAGS)
+ALL_CFLAGS+=$(shell pkg-config --cflags $(PACKAGE_DEPS)) \
+	-fPIC -Wall -Werror $(CFLAGS)
 
 all: $(SONAME) $(BIN)