diff --git a/src/gui/C4KeyboardInput.cpp b/src/gui/C4KeyboardInput.cpp
index b799715db..73aa291a8 100644
--- a/src/gui/C4KeyboardInput.cpp
+++ b/src/gui/C4KeyboardInput.cpp
@@ -450,7 +450,7 @@ StdStrBuf C4KeyCodeEx::KeyCode2String(C4KeyCode wCode, bool fHumanReadable, bool
 	StdStrBuf buf;
 	auto name = KeycodeToString(wCode);
 	if (name) buf.Copy(name);
-	if (!buf.getLength()) buf.Format("\\x%x", wCode);
+	if (!buf.getLength()) buf.Format("\\x%lx", wCode);
 	return buf;
 #endif
 	return FormatString("$%x", static_cast<unsigned int>(wCode));
diff --git a/src/script/C4AulCompiler.cpp b/src/script/C4AulCompiler.cpp
index e70710f8f..1d5cd0823 100644
--- a/src/script/C4AulCompiler.cpp
+++ b/src/script/C4AulCompiler.cpp
@@ -1150,7 +1150,7 @@ void C4AulCompiler::CodegenAstVisitor::visit(const ::aul::ast::CallExpr *n)
 		}
 	}
 
-	int fn_argc = C4AUL_MAX_Par;
+	size_t fn_argc = C4AUL_MAX_Par;
 	if (!n->context)
 	{
 		// if this is a function without explicit context, we resolve it
@@ -1169,7 +1169,7 @@ void C4AulCompiler::CodegenAstVisitor::visit(const ::aul::ast::CallExpr *n)
 	{
 		// Pop off any args that are over the limit
 		Warn(target_host, host, n->args[fn_argc].get(), Fn,
-			"call to %s passes %d parameters, of which only %d are used", cname, n->args.size(), fn_argc);
+			"call to %s passes %zu parameters, of which only %zu are used", cname, n->args.size(), fn_argc);
 		AddBCC(n->loc, AB_STACK, fn_argc - n->args.size());
 	}
 	else if (n->args.size() < fn_argc)
@@ -1249,7 +1249,7 @@ void C4AulCompiler::CodegenAstVisitor::visit(const ::aul::ast::CallExpr *n)
 		C4V_Type to = expected_par_types[i];
 		if (C4Value::WarnAboutConversion(from, to))
 		{
-			Warn(target_host, host, n->args[i].get(), Fn, "parameter %d of %s is %s (%s expected)", i, cname, GetC4VName(from), GetC4VName(to));
+			Warn(target_host, host, n->args[i].get(), Fn, "parameter %zu of %s is %s (%s expected)", i, cname, GetC4VName(from), GetC4VName(to));
 		}
 	}
 
diff --git a/src/script/C4AulParse.cpp b/src/script/C4AulParse.cpp
index 4e4c6673c..8dacf92ac 100644
--- a/src/script/C4AulParse.cpp
+++ b/src/script/C4AulParse.cpp
@@ -1103,7 +1103,7 @@ void C4AulParse::Parse_CallParams(::aul::ast::CallExpr *call)
 	case ATT_COMMA:
 		// got no parameter before a ","
 		if (Config.Developer.ExtraWarnings)
-			Warn(FormatString("parameter %d of call to %s is empty", call->args.size(), call->callee.c_str()).getData(), NULL);
+			Warn(FormatString("parameter %zu of call to %s is empty", call->args.size(), call->callee.c_str()).getData(), NULL);
 		call->args.push_back(::aul::ast::NilLit::New(TokenSPos));
 		Shift();
 		break;
@@ -1137,7 +1137,7 @@ std::unique_ptr<::aul::ast::ArrayLit> C4AulParse::Parse_Array()
 		if (TokenType == ATT_COMMA)
 		{
 			if (Config.Developer.ExtraWarnings)
-				Warn(FormatString("array entry %d is empty", arr->values.size()).getData(), NULL);
+				Warn(FormatString("array entry %zu is empty", arr->values.size()).getData(), NULL);
 			arr->values.emplace_back(::aul::ast::NilLit::New(TokenSPos));
 		}
 		else
@@ -1149,7 +1149,7 @@ std::unique_ptr<::aul::ast::ArrayLit> C4AulParse::Parse_Array()
 		if (TokenType == ATT_BCLOSE2)
 		{
 			if (Config.Developer.ExtraWarnings)
-				Warn(FormatString("array entry %d is empty", arr->values.size()).getData(), NULL);
+				Warn(FormatString("array entry %zu is empty", arr->values.size()).getData(), NULL);
 			arr->values.emplace_back(::aul::ast::NilLit::New(TokenSPos));
 		}
 	}