3 files changed, 3 insertions, 3 deletions
diff --git a/src/resources/dye.h b/src/resources/dye.h
index 16f476399..557e8524e 100644
--- a/src/resources/dye.h
+++ b/src/resources/dye.h
@@ -102,7 +102,7 @@ class Dye final
          * The parts of string are separated by semi-colons. Each part starts
          * by an uppercase letter, followed by a colon and then a palette name.
          */
-        Dye(const std::string &dye);
+        explicit Dye(const std::string &dye);
 
         A_DELETE_COPY(Dye)
 
diff --git a/src/resources/sdlmusic.h b/src/resources/sdlmusic.h
index 5b60ebb64..8d2b24044 100644
--- a/src/resources/sdlmusic.h
+++ b/src/resources/sdlmusic.h
@@ -73,7 +73,7 @@ class SDLMusic final : public Resource
         /**
          * Constructor.
          */
-        SDLMusic(Mix_Music *const music);
+        explicit SDLMusic(Mix_Music *const music);
 
         Mix_Music *mMusic;
 };
diff --git a/src/resources/soundeffect.h b/src/resources/soundeffect.h
index 50ddd562d..20164a397 100644
--- a/src/resources/soundeffect.h
+++ b/src/resources/soundeffect.h
@@ -69,7 +69,7 @@ class SoundEffect final : public Resource
         /**
          * Constructor.
          */
-        SoundEffect(Mix_Chunk *const soundEffect) :
+        explicit SoundEffect(Mix_Chunk *const soundEffect) :
             Resource(),
             mChunk(soundEffect)
         { }