diff --git a/lfs.c b/lfs.c
index 4edf6b7..8ce1872 100644
--- a/lfs.c
+++ b/lfs.c
@@ -471,7 +471,7 @@ static int lfs_alloc(lfs_t *lfs, lfs_block_t *block) {
 
         // check if we have looked at all blocks since last ack
         if (lfs->free.ack == 0) {
-            LFS_WARN("No more free space %"PRIu32,
+            LFS_ERROR("No more free space %"PRIu32,
                     lfs->free.i + lfs->free.off);
             return LFS_ERR_NOSPC;
         }
diff --git a/lfs_util.h b/lfs_util.h
index 5e29b61..80fab55 100644
--- a/lfs_util.h
+++ b/lfs_util.h
@@ -51,28 +51,28 @@ extern "C"
 // Logging functions
 #ifdef LFS_YES_TRACE
 #define LFS_TRACE(fmt, ...) \
-    printf("lfs trace:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_trace:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_TRACE(fmt, ...)
 #endif
 
 #ifndef LFS_NO_DEBUG
 #define LFS_DEBUG(fmt, ...) \
-    printf("lfs debug:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_debug:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_DEBUG(fmt, ...)
 #endif
 
 #ifndef LFS_NO_WARN
 #define LFS_WARN(fmt, ...) \
-    printf("lfs warn:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_warn:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_WARN(fmt, ...)
 #endif
 
 #ifndef LFS_NO_ERROR
 #define LFS_ERROR(fmt, ...) \
-    printf("lfs error:%d: " fmt "\n", __LINE__, __VA_ARGS__)
+    printf("lfs_error:%d: " fmt "\n", __LINE__, __VA_ARGS__)
 #else
 #define LFS_ERROR(fmt, ...)
 #endif