diff --git a/src/doomdata.h b/src/doomdata.h
index 05bcfbfc1..8e992a812 100644
--- a/src/doomdata.h
+++ b/src/doomdata.h
@@ -441,7 +441,7 @@ struct FPlayerStart
 	DVector3 pos;
 	int16_t angle, type;
 
-	FPlayerStart() { }
+	FPlayerStart() = default;
 	FPlayerStart(const FMapThing *mthing, int pnum)
 	: pos(mthing->pos),
 	  angle(mthing->angle),
diff --git a/src/g_shared/dthinker.h b/src/g_shared/dthinker.h
index 26b4e06ac..07d884fc4 100644
--- a/src/g_shared/dthinker.h
+++ b/src/g_shared/dthinker.h
@@ -142,9 +142,6 @@ public:
 	FThinkerIterator (FLevelLocals *Level, const PClass *type, int statnum, DThinker *prev);
 	DThinker *Next (bool exact = false);
 	void Reinit ();
-
-protected:
-	FThinkerIterator() {}
 };
 
 template <class T> class TThinkerIterator : public FThinkerIterator
diff --git a/src/gamedata/g_mapinfo.h b/src/gamedata/g_mapinfo.h
index d18c92fcb..f105d3f0c 100644
--- a/src/gamedata/g_mapinfo.h
+++ b/src/gamedata/g_mapinfo.h
@@ -528,7 +528,7 @@ struct FSkillInfo
 	int Infighting;
 	bool PlayerRespawn;
 
-	FSkillInfo() {}
+	FSkillInfo() = default;
 	FSkillInfo(const FSkillInfo &other)
 	{
 		operator=(other);
diff --git a/src/gamedata/info.h b/src/gamedata/info.h
index df294ec78..622ffe6a0 100644
--- a/src/gamedata/info.h
+++ b/src/gamedata/info.h
@@ -267,7 +267,7 @@ struct FActorInfo
 
 	uint8_t DefaultStateUsage = 0; // state flag defaults for blocks without a qualifier.
 
-	FActorInfo() {}
+	FActorInfo() = default;
 	FActorInfo(const FActorInfo & other)
 	{
 		// only copy the fields that get inherited