diff --git a/src/libsysprof-capture/sysprof-capture-types.h b/src/libsysprof-capture/sysprof-capture-types.h
index 11e3d190..f5e73c61 100644
--- a/src/libsysprof-capture/sysprof-capture-types.h
+++ b/src/libsysprof-capture/sysprof-capture-types.h
@@ -131,6 +131,9 @@ typedef enum
   SYSPROF_CAPTURE_FRAME_ALLOCATION   = 14,
 } SysprofCaptureFrameType;
 
+/* Not part of ABI */
+#define SYSPROF_CAPTURE_FRAME_LAST 15
+
 SYSPROF_ALIGNED_BEGIN(1)
 typedef struct
 {