diff --git a/apps/plugins/lua/malloc.c b/apps/plugins/lua/malloc.c
index 6dc00c4f9a..e96497e4bb 100644
--- a/apps/plugins/lua/malloc.c
+++ b/apps/plugins/lua/malloc.c
@@ -2155,7 +2155,7 @@ static void reset_on_error(mstate m);
 
 /* -------------------------- Debugging setup ---------------------------- */
 
-#if ! DEBUG
+#ifndef DEBUG
 
 #define check_free_chunk(M,P)
 #define check_inuse_chunk(M,P)
@@ -2511,7 +2511,7 @@ static int change_mparam(int param_number, int value) {
   }
 }
 
-#if DEBUG
+#ifdef DEBUG
 /* ------------------------- Debugging Support --------------------------- */
 
 /* Check properties of any chunk, whether free, inuse, mmapped etc  */
@@ -3995,7 +3995,7 @@ static void** ialloc(mstate m,
     }
   }
 
-#if DEBUG
+#ifdef DEBUG
   if (marray != chunks) {
     /* final element must have exactly exhausted chunk */
     if (element_size != 0) {
diff --git a/apps/plugins/lua/rockmalloc.h b/apps/plugins/lua/rockmalloc.h
index 46a943f59e..256c583e37 100644
--- a/apps/plugins/lua/rockmalloc.h
+++ b/apps/plugins/lua/rockmalloc.h
@@ -35,7 +35,7 @@
 #define HAVE_MREMAP 0
 #define NO_MALLINFO 1
 #define ABORT ((void) 0)
-#define DEBUG 0
+/* #define DEBUG */
 #define MORECORE rocklua_morecore
 
 void *rocklua_morecore(int size);