diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index 7466ac999..f19776622 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -88,6 +88,7 @@ INCLUDES = \
 
 test_conformance_CPPFLAGS = \
 	-DG_DISABLE_SINGLE_INCLUDES \
+	-DCOGL_ENABLE_EXPERIMENTAL_API \
 	-DCOGL_DISABLE_DEPRECATED \
 	-DCLUTTER_DISABLE_DEPRECATED \
 	-DTESTS_DATADIR=\""$(top_srcdir)/tests/data"\"
diff --git a/tests/conform/test-cogl-pixel-buffer.c b/tests/conform/test-cogl-pixel-buffer.c
index cc4c28943..bdaba96fe 100644
--- a/tests/conform/test-cogl-pixel-buffer.c
+++ b/tests/conform/test-cogl-pixel-buffer.c
@@ -1,6 +1,3 @@
-
-#define COGL_ENABLE_EXPERIMENTAL_API
-
 #include <clutter/clutter.h>
 #include <cogl/cogl.h>
 #include <string.h>