diff --git a/makerom/deps/libyaml/makefile b/makerom/deps/libyaml/makefile
index 5115fe9..f2c8770 100644
--- a/makerom/deps/libyaml/makefile
+++ b/makerom/deps/libyaml/makefile
@@ -85,7 +85,7 @@ else ifeq ($(PROJECT_PLATFORM), GNU)
 	# GNU/Linux Flags/Libs
 	#CC = 
 	#CXX =
-	DEFINEFLAGS = -D_DEFAULT_SOURCE
+	DEFINEFLAGS = -D_GNU_SOURCE
 	WARNFLAGS = -Wall -Wno-unused-value -Wno-unused-but-set-variable
 	ARCHFLAGS =
 	INC +=
diff --git a/makerom/makefile b/makerom/makefile
index f91df21..546ff97 100644
--- a/makerom/makefile
+++ b/makerom/makefile
@@ -85,7 +85,7 @@ else ifeq ($(PROJECT_PLATFORM), GNU)
 	# GNU/Linux Flags/Libs
 	#CC = 
 	#CXX =
-	DEFINEFLAGS = -D_DEFAULT_SOURCE
+	DEFINEFLAGS = -D_GNU_SOURCE
 	WARNFLAGS = -Wall -Wno-unused-value -Wno-unused-but-set-variable
 	ARCHFLAGS =
 	INC +=