diff --git a/test/Makefile b/test/Makefile
index 8d859583..fb10d575 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,5 +1,5 @@
 OPTFLAGS := -g3 -fmerge-constants
-CFLAGS := $(OPTFLAGS) -Wall -D_GNU_SOURCE -DTRACY_ENABLE
+CFLAGS := $(OPTFLAGS) -Wall -DTRACY_ENABLE
 CXXFLAGS := $(CFLAGS) -std=gnu++14
 DEFINES +=
 INCLUDES :=