diff --git a/source/Makefile.mk b/source/Makefile.mk
index 8c7dd7bb8..6240c1262 100644
--- a/source/Makefile.mk
+++ b/source/Makefile.mk
@@ -216,6 +216,9 @@ endif
 ifeq ($(HAVE_QT5),true)
 HAVE_QT=true
 endif
+ifeq ($(WIN32),true)
+HAVE_QT=true
+endif
 
 # --------------------------------------------------------------
 # Set PyQt tools
diff --git a/source/backend/plugin/JucePlugin.cpp b/source/backend/plugin/JucePlugin.cpp
index b43f357e9..30cd73d22 100644
--- a/source/backend/plugin/JucePlugin.cpp
+++ b/source/backend/plugin/JucePlugin.cpp
@@ -890,7 +890,7 @@ public:
         }
     }
 
-    bool processSingle(float** const inBuffer, float** const outBuffer, const uint32_t frames)
+    bool processSingle(const float** const inBuffer, float** const outBuffer, const uint32_t frames)
     {
         CARLA_SAFE_ASSERT_RETURN(frames > 0, false);