diff --git a/modules/src/alloc/Malloc.c b/modules/src/alloc/Malloc.c
index fa28074d9..29951d013 100644
--- a/modules/src/alloc/Malloc.c
+++ b/modules/src/alloc/Malloc.c
@@ -18,6 +18,6 @@ Malloc(sz)
 {
 	register char *res = malloc(sz);
 	
-	if (res == 0) No_Mem();
+	if (sz && res == 0) No_Mem();
 	return res;
 }
diff --git a/modules/src/alloc/Realloc.c b/modules/src/alloc/Realloc.c
index 7d2ff7f5f..527b5268e 100644
--- a/modules/src/alloc/Realloc.c
+++ b/modules/src/alloc/Realloc.c
@@ -18,6 +18,6 @@ Realloc(ptr, sz)
 	unsigned int sz;
 {
 	register char *mptr = realloc(ptr, sz);
-	if (mptr == 0) No_Mem();
+	if (sz && mptr == 0) No_Mem();
 	return mptr;
 }
diff --git a/modules/src/alloc/Salloc.c b/modules/src/alloc/Salloc.c
index 2773360b7..4d16045c2 100644
--- a/modules/src/alloc/Salloc.c
+++ b/modules/src/alloc/Salloc.c
@@ -24,7 +24,7 @@ Salloc(str, sz)
 	char *res = malloc(sz);
 	register char *m = res;
 
-	if (m == 0) No_Mem();
+	if (sz && m == 0) No_Mem();
 	while (sz--)
 		*m++ = *str++;
 	return res;