diff --git a/liblog/event_tag_map.c b/liblog/event_tag_map.c
index f9cad99..e8e0335 100644
--- a/liblog/event_tag_map.c
+++ b/liblog/event_tag_map.c
@@ -73,12 +73,13 @@
     EventTagMap* newTagMap;
     off_t end;
     int save_errno;
+    const char* tagfile = fileName ? fileName : EVENT_TAG_MAP_FILE;
 
-    int fd = open(fileName, O_RDONLY | O_CLOEXEC);
+    int fd = open(tagfile, O_RDONLY | O_CLOEXEC);
     if (fd < 0) {
         save_errno = errno;
         fprintf(stderr, "%s: unable to open map '%s': %s\n",
-                OUT_TAG, fileName, strerror(save_errno));
+                OUT_TAG, tagfile, strerror(save_errno));
         goto fail_errno;
     }
 
@@ -87,7 +88,7 @@
     (void) lseek(fd, 0L, SEEK_SET);
     if (end < 0) {
         fprintf(stderr, "%s: unable to seek map '%s' %s\n",
-                OUT_TAG, fileName, strerror(save_errno));
+                OUT_TAG, tagfile, strerror(save_errno));
         goto fail_close;
     }
 
@@ -103,7 +104,7 @@
     fd = -1;
     if ((newTagMap->mapAddr == MAP_FAILED) || (newTagMap->mapAddr == NULL)) {
         fprintf(stderr, "%s: mmap(%s) failed: %s\n",
-                OUT_TAG, fileName, strerror(save_errno));
+                OUT_TAG, tagfile, strerror(save_errno));
         goto fail_free;
     }
 
diff --git a/liblog/logger_write.c b/liblog/logger_write.c
index 157bd88..170c8d1 100644
--- a/liblog/logger_write.c
+++ b/liblog/logger_write.c
@@ -293,7 +293,7 @@
             ret = __android_log_trylock();
             m = (EventTagMap *)atomic_load(&tagMap); /* trylock flush cache */
             if (!m) {
-                m = android_openEventTagMap(EVENT_TAG_MAP_FILE);
+                m = android_openEventTagMap(NULL);
                 if (ret) { /* trylock failed, use local copy, mark for close */
                     f = m;
                 } else {