diff --git a/common/camera.cpp b/common/camera.cpp
index 05e4b8ea..4b41b6b7 100644
--- a/common/camera.cpp
+++ b/common/camera.cpp
@@ -107,7 +107,7 @@ void lcCamera::CreateName(const lcArray<lcCamera*>& Cameras)
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
 			int CameraNumber = CameraName.midRef(Prefix.size()).toInt(&Ok);
 #else
-			int CameraNumber = CameraName.midRef((int)strlen(Prefix.latin1())).toInt(&Ok);
+			int CameraNumber = CameraName.mid((int)strlen(Prefix.latin1())).toInt(&Ok);
 #endif
 
 			if (Ok && CameraNumber > MaxCameraNumber)
diff --git a/common/light.cpp b/common/light.cpp
index 66c7b012..a98a83c8 100644
--- a/common/light.cpp
+++ b/common/light.cpp
@@ -84,7 +84,7 @@ void lcLight::CreateName(const lcArray<lcLight*>& Lights)
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
 			int LightNumber = LightName.midRef(Prefix.size()).toInt(&Ok);
 #else
-			int LightNumber = LightName.midRef((int)strlen(Prefix.latin1())).toInt(&Ok);
+			int LightNumber = LightName.mid((int)strlen(Prefix.latin1())).toInt(&Ok);
 #endif
 
 			if (Ok && LightNumber > MaxLightNumber)