diff --git a/libisofs/messages.c b/libisofs/messages.c
index 74a9c1d..d326675 100644
--- a/libisofs/messages.c
+++ b/libisofs/messages.c
@@ -247,9 +247,8 @@ void iso_msg_debug(int imgid, const char *fmt, ...)
 {
     char *msg = NULL;
     va_list ap;
-    int ret;
 
-    LIBISO_ALLOC_MEM(msg, char, MAX_MSG_LEN);
+    LIBISO_ALLOC_MEM_VOID(msg, char, MAX_MSG_LEN);
     va_start(ap, fmt);
     vsnprintf(msg, MAX_MSG_LEN, fmt, ap);
     va_end(ap);
diff --git a/libisofs/util.h b/libisofs/util.h
index 7afc632..8bcaef1 100644
--- a/libisofs/util.h
+++ b/libisofs/util.h
@@ -547,6 +547,12 @@ void *iso_alloc_mem(size_t size, size_t count, int flag);
                 ret= ISO_OUT_OF_MEM; goto ex; \
         } }
 
+#define LIBISO_ALLOC_MEM_VOID(pt, typ, count) { \
+        pt= (typ *) iso_alloc_mem(sizeof(typ), (size_t) (count), 0); \
+        if(pt == NULL) { \
+                goto ex; \
+        } }
+
 #define LIBISO_FREE_MEM(pt) { \
         if(pt != NULL) \
                 free((char *) pt); \