diff --git a/include/cyclone/types.h b/include/cyclone/types.h
index 85d3609e..c0c1e711 100644
--- a/include/cyclone/types.h
+++ b/include/cyclone/types.h
@@ -125,10 +125,10 @@ typedef unsigned char tag_type;
 #define DEBUG_SHOW_DIAG 0
 
 /** Show diagnostic information before/after sweeping */
-#define GC_DEBUG_SHOW_SWEEP_DIAG 0
+#define GC_DEBUG_SHOW_SWEEP_DIAG 1
 
 /** GC debugging flag */
-#define GC_DEBUG_TRACE 0
+#define GC_DEBUG_TRACE 1
 
 /** GC debugging flag */
 #define GC_DEBUG_VERBOSE 0