diff --git a/tools/b43-tools/Makefile b/tools/b43-tools/Makefile
index a99b0c9e53d..cf1f118c157 100644
--- a/tools/b43-tools/Makefile
+++ b/tools/b43-tools/Makefile
@@ -26,7 +26,7 @@ define Host/Compile
 		$(HOST_MAKE_FLAGS) \
 		$(1) QUIET_SPARSE=:
 	+$(MAKE) $(HOST_JOBS) -C $(HOST_BUILD_DIR)/assembler \
-		CFLAGS="$(HOST_CFLAGS) -include endian.h" \
+		CFLAGS="$(HOST_CFLAGS) -include endian.h -Wno-error=int-conversion" \
 		$(HOST_MAKE_FLAGS) \
 		LDFLAGS= \
 		$(1) QUIET_SPARSE=: