diff --git a/Makefile b/Makefile
index 469d1dfdf1..2d9c53294b 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ HEADERS = $(wildcard */*.h) $(wildcard *.h)
 LIBS = -lm
 DEFINES = -DHAVE_CONFIG_H
 
-ifneq ($(findstring Darwin,$(shell uname -a)),)
+ifneq ($(findstring Darwin,$(OS)),)
    OSX := 1
    LIBS += -framework AppKit
 else
@@ -18,7 +18,7 @@ endif
 
 BSD_LOCAL_INC =
 DYLIB_LIB = -ldl
-ifneq ($(findstring BSD,$(shell uname -a)),)
+ifneq ($(findstring BSD,$(OS)),)
    BSD_LOCAL_INC = -I/usr/local/include
    DYLIB_LIB = -lc
 endif
diff --git a/qb/config.libs.sh b/qb/config.libs.sh
index 01a5bbccbf..0955dd98b3 100644
--- a/qb/config.libs.sh
+++ b/qb/config.libs.sh
@@ -73,6 +73,8 @@ check_lib STRL -lc strlcpy
 
 check_pkgconf PYTHON python3
 
+add_define_make OS $OS
+
 # Creates config.mk and config.h.
 VARS="ALSA OSS OSS_BSD OSS_LIB AL RSOUND ROAR JACK PULSE SDL DYLIB CG XML SDL_IMAGE DYNAMIC FFMPEG AVCODEC AVFORMAT AVUTIL SWSCALE SRC CONFIGFILE FREETYPE XVIDEO NETPLAY FBO STRL PYTHON"
 create_config_make config.mk $VARS