diff --git a/src/d_main.cpp b/src/d_main.cpp
index 12ea85c47..91fde3cfa 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -277,7 +277,7 @@ void D_ToggleHud()
 	static int saved_screenblocks;
 	static bool saved_drawplayersprite, saved_showmessages;
 
-	if (hud_toggled = !hud_toggled)
+	if ((hud_toggled = !hud_toggled))
 	{
 		saved_screenblocks = screenblocks;
 		saved_drawplayersprite = r_drawplayersprites;
diff --git a/src/rendering/r_videoscale.cpp b/src/rendering/r_videoscale.cpp
index d86221ede..5a3f228a5 100644
--- a/src/rendering/r_videoscale.cpp
+++ b/src/rendering/r_videoscale.cpp
@@ -144,7 +144,7 @@ namespace
 	};
 	bool isOutOfBounds(int x)
 	{
-		return (x < 0 || x >= NUMSCALEMODES || vScaleTable[x].isValid == false);
+		return (x < 0 || x >= int(NUMSCALEMODES) || vScaleTable[x].isValid == false);
 	}
 }
 
diff --git a/src/sound/s_reverbedit.cpp b/src/sound/s_reverbedit.cpp
index abbaceef1..7c41b10eb 100644
--- a/src/sound/s_reverbedit.cpp
+++ b/src/sound/s_reverbedit.cpp
@@ -236,7 +236,6 @@ void ExportEnvironments(const char *filename, uint32_t count, const ReverbContai
 		{
 			const ReverbContainer *env = envs[i];
 			const ReverbContainer *base;
-			size_t j;
 
 			if ((unsigned int)env->Properties.Environment < 26)
 			{
@@ -247,7 +246,7 @@ void ExportEnvironments(const char *filename, uint32_t count, const ReverbContai
 				base = nullptr;
 			}
 			f->Printf("\"%s\" %u %u\n{\n", env->Name, HIBYTE(env->ID), LOBYTE(env->ID));
-			for (j = 0; j < NumReverbs; ++j)
+			for (int j = 0; j < NumReverbs; ++j)
 			{
 				const FReverbField *ctl = &ReverbFields[j];
 				const char *ctlName = ReverbFieldNames[j];