diff --git a/api/logic/Json.h b/api/logic/Json.h
index 321007cd..a84d204a 100644
--- a/api/logic/Json.h
+++ b/api/logic/Json.h
@@ -123,7 +123,7 @@ T ensureIsType(const QJsonValue &value, const T default_ = T(), const QString &w
 	{
 		return requireIsType<T>(value, what);
 	}
-	catch (JsonException)
+	catch (const JsonException &)
 	{
 		return default_;
 	}
diff --git a/libraries/classparser/src/classparser.cpp b/libraries/classparser/src/classparser.cpp
index bf5cc039..6587a2b9 100644
--- a/libraries/classparser/src/classparser.cpp
+++ b/libraries/classparser/src/classparser.cpp
@@ -70,7 +70,7 @@ QString GetMinecraftJarVersion(QString jarName)
 			}
 		}
 	}
-	catch (java::classfile_exception) { }
+	catch (const java::classfile_exception &) { }
 
 	// clean up
 	delete[] classfile;