diff --git a/src/ports/SkFontMgr_android_ndk.cpp b/src/ports/SkFontMgr_android_ndk.cpp
index 45088cffb1..289c0a1bdb 100644
--- a/src/ports/SkFontMgr_android_ndk.cpp
+++ b/src/ports/SkFontMgr_android_ndk.cpp
@@ -722,7 +722,9 @@ public:
         uint32_t fHash;
     };
     sk_sp<SkTypeface> find(const Request& request) {
-        SkAutoSharedMutexShared lock(fMutex);
+        // SkLRUCache::find() mutates the LRU list (remove + addToHead) on a
+        // cache hit, so it must be guarded by the exclusive lock.
+        SkAutoSharedMutexExclusive lock(fMutex);
         sk_sp<SkTypeface>* typeface = fRequests.find(request);
         if (typeface) {
             return *typeface;
@@ -773,7 +775,9 @@ public:
         uint32_t fHash;
     };
     sk_sp<SkTypeface> find(const Match& match) {
-        SkAutoSharedMutexShared lock(fMutex);
+        // SkLRUCache::find() mutates the LRU list (remove + addToHead) on a
+        // cache hit, so it must be guarded by the exclusive lock.
+        SkAutoSharedMutexExclusive lock(fMutex);
         sk_sp<SkTypeface>* typeface = fMatches.find(match);
         if (typeface) {
             return *typeface;