diff --git a/core/jni/android/graphics/FontFamily.cpp b/core/jni/android/graphics/FontFamily.cpp
index e07a20880b946..2e7501f0e0bef 100644
--- a/core/jni/android/graphics/FontFamily.cpp
+++ b/core/jni/android/graphics/FontFamily.cpp
@@ -83,7 +83,8 @@ static jlong FontFamily_create(jlong builderPtr) {
         return 0;
     }
     std::shared_ptr<minikin::FontFamily> family = std::make_shared<minikin::FontFamily>(
-            builder->langId, builder->variant, std::move(builder->fonts));
+            builder->langId, builder->variant, std::move(builder->fonts),
+            true /* isCustomFallback */);
     if (family->getCoverage().length() == 0) {
         return 0;
     }
diff --git a/core/jni/android/graphics/fonts/FontFamily.cpp b/core/jni/android/graphics/fonts/FontFamily.cpp
index 767e068381d99..249e4f3e9212d 100644
--- a/core/jni/android/graphics/fonts/FontFamily.cpp
+++ b/core/jni/android/graphics/fonts/FontFamily.cpp
@@ -57,7 +57,7 @@ static void FontFamily_Builder_addFont(jlong builderPtr, jlong fontPtr) {
 
 // Regular JNI
 static jlong FontFamily_Builder_build(JNIEnv* env, jobject clazz, jlong builderPtr,
-            jstring langTags, jint variant) {
+            jstring langTags, jint variant, jboolean isCustomFallback) {
     std::unique_ptr<NativeFamilyBuilder> builder(toBuilder(builderPtr));
     uint32_t localeId;
     if (langTags == nullptr) {
@@ -67,7 +67,8 @@ static jlong FontFamily_Builder_build(JNIEnv* env, jobject clazz, jlong builderP
         localeId = minikin::registerLocaleList(str.c_str());
     }
     std::shared_ptr<minikin::FontFamily> family = std::make_shared<minikin::FontFamily>(
-            localeId, static_cast<minikin::FamilyVariant>(variant), std::move(builder->fonts));
+            localeId, static_cast<minikin::FamilyVariant>(variant), std::move(builder->fonts),
+            isCustomFallback);
     if (family->getCoverage().length() == 0) {
         // No coverage means minikin rejected given font for some reasons.
         jniThrowException(env, "java/lang/IllegalArgumentException",
@@ -87,7 +88,7 @@ static jlong FontFamily_Builder_GetReleaseFunc() {
 static const JNINativeMethod gFontFamilyBuilderMethods[] = {
     { "nInitBuilder", "()J", (void*) FontFamily_Builder_initBuilder },
     { "nAddFont", "(JJ)V", (void*) FontFamily_Builder_addFont },
-    { "nBuild", "(JLjava/lang/String;I)J", (void*) FontFamily_Builder_build },
+    { "nBuild", "(JLjava/lang/String;IZ)J", (void*) FontFamily_Builder_build },
 
     { "nGetReleaseNativeFamily", "()J", (void*) FontFamily_Builder_GetReleaseFunc },
 };
diff --git a/graphics/java/android/graphics/fonts/FontFamily.java b/graphics/java/android/graphics/fonts/FontFamily.java
index 14d31d9dfd86b..c0f1b163ea114 100644
--- a/graphics/java/android/graphics/fonts/FontFamily.java
+++ b/graphics/java/android/graphics/fonts/FontFamily.java
@@ -108,16 +108,17 @@ public final class FontFamily {
          * @return a font family
          */
         public @NonNull FontFamily build() {
-            return build("", FontConfig.Family.VARIANT_DEFAULT);
+            return build("", FontConfig.Family.VARIANT_DEFAULT, true /* isCustomFallback */);
         }
 
         /** @hide */
-        public @NonNull FontFamily build(@NonNull String langTags, int variant) {
+        public @NonNull FontFamily build(@NonNull String langTags, int variant,
+                boolean isCustomFallback) {
             final long builderPtr = nInitBuilder();
             for (int i = 0; i < mFonts.size(); ++i) {
                 nAddFont(builderPtr, mFonts.get(i).getNativePtr());
             }
-            final long ptr = nBuild(builderPtr, langTags, variant);
+            final long ptr = nBuild(builderPtr, langTags, variant, isCustomFallback);
             final FontFamily family = new FontFamily(mFonts, ptr);
             sFamilyRegistory.registerNativeAllocation(family, ptr);
             return family;
@@ -130,7 +131,8 @@ public final class FontFamily {
         private static native long nInitBuilder();
         @CriticalNative
         private static native void nAddFont(long builderPtr, long fontPtr);
-        private static native long nBuild(long builderPtr, String langTags, int variant);
+        private static native long nBuild(long builderPtr, String langTags, int variant,
+                boolean isCustomFallback);
         @CriticalNative
         private static native long nGetReleaseNativeFamily();
     }
diff --git a/graphics/java/android/graphics/fonts/SystemFonts.java b/graphics/java/android/graphics/fonts/SystemFonts.java
index 750adb2757c8a..4a9cf14d04a5c 100644
--- a/graphics/java/android/graphics/fonts/SystemFonts.java
+++ b/graphics/java/android/graphics/fonts/SystemFonts.java
@@ -208,7 +208,7 @@ public final class SystemFonts {
                 b.addFont(font);
             }
         }
-        return b == null ? null : b.build(languageTags, variant);
+        return b == null ? null : b.build(languageTags, variant, false /* isCustomFallback */);
     }
 
     private static void appendNamedFamily(@NonNull FontConfig.Family xmlFamily,