diff --git a/tools/Makefile b/tools/Makefile
index 9e9c9cc2..3a9eb342 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,9 +1,8 @@
 CC := gcc
 CXX := g++
-ifeq ($(OSX_BUILD),1)
-CFLAGS := -I../include -I. -Wall -Wextra -Wno-unused-parameter -pedantic -std=c99 -O2 -s -Wno-error=implicit-function-declaration
-else
 CFLAGS := -I../include -I. -Wall -Wextra -Wno-unused-parameter -pedantic -std=c99 -O2 -s
+ifeq ($(shell uname),Darwin)
+CFLAGS += -Wno-error=implicit-function-declaration
 endif
 LDFLAGS := -lm
 PROGRAMS := n64graphics n64graphics_ci mio0 n64cksum textconv patch_libultra_math aifc_decode aiff_extract_codebook vadpcm_enc tabledesign extract_data_for_mio skyconv