--- wit-2.30a/src/lib-file.c
+++ wit-2.30a/src/lib-file.c
@@ -3510,7 +3510,7 @@
     DASSERT(fmap);
     DASSERT(n_elem>0);
 
-    memset(fmap,0,sizeof(fmap));
+    memset(fmap,0,sizeof(*fmap));
 
     u64 last_off = 0;
     while ( last_off < file->st.st_size )
--- wit-2.30a/src/wfuse.c
+++ wit-2.30a/src/wfuse.c
@@ -340,7 +340,7 @@
 	    }
 	    ResetWBFS(df->wbfs);
 	    FREE(df->wbfs);
-	    memset(df,0,sizeof(df));
+	    memset(df,0,sizeof(*df));
 	    n_dfile--;
 	}
 
@@ -352,7 +352,7 @@
 
     if (found_df)
     {
-	memset(found_df,0,sizeof(found_df));
+	memset(found_df,0,sizeof(*found_df));
 	WBFS_t * wbfs = MALLOC(sizeof(*wbfs));
 	InitializeWBFS(wbfs);
 	enumError err = OpenWBFS(wbfs,source_file,false,true,0);