diff --git a/engine/src/flutter/include/minikin/FontFamily.h b/engine/src/flutter/include/minikin/FontFamily.h
index 7bdff6eb4f..4d7d08378a 100644
--- a/engine/src/flutter/include/minikin/FontFamily.h
+++ b/engine/src/flutter/include/minikin/FontFamily.h
@@ -65,10 +65,10 @@ private:
 // so it can be efficiently copied, embedded in other objects, etc.
 class FontStyle {
 public:
-    FontStyle(int weight = 4, bool italic = false) {
+    explicit FontStyle(int weight = 4, bool italic = false) {
         bits = (weight & kWeightMask) | (italic ? kItalicMask : 0);
     }
-    FontStyle(FontLanguage lang, int variant = 0, int weight = 4, bool italic = false) {
+    explicit FontStyle(FontLanguage lang, int variant = 0, int weight = 4, bool italic = false) {
         bits = (weight & kWeightMask) | (italic ? kItalicMask : 0)
                 | (variant << kVariantShift) | (lang.bits() << kLangShift);
     }
diff --git a/engine/src/flutter/include/minikin/MinikinFont.h b/engine/src/flutter/include/minikin/MinikinFont.h
index 7f65cd7b0a..b7e6f87f78 100644
--- a/engine/src/flutter/include/minikin/MinikinFont.h
+++ b/engine/src/flutter/include/minikin/MinikinFont.h
@@ -33,7 +33,7 @@ namespace android {
 class HyphenEdit {
 public:
     HyphenEdit() : hyphen(0) { }
-    HyphenEdit(uint32_t hyphenInt) : hyphen(hyphenInt) { }
+    HyphenEdit(uint32_t hyphenInt) : hyphen(hyphenInt) { }  // NOLINT(implicit)
     bool hasHyphen() const { return hyphen != 0; }
     bool operator==(const HyphenEdit &other) const { return hyphen == other.hyphen; }
 private: