diff --git a/plugins/zynaddsubfx/AUTHORS.txt b/plugins/zynaddsubfx/AUTHORS.txt
index 3018c29a0..e2441c036 100644
--- a/plugins/zynaddsubfx/AUTHORS.txt
+++ b/plugins/zynaddsubfx/AUTHORS.txt
@@ -13,6 +13,6 @@ Contributors:
         Achim Settelmeier (QUERTZ keyboard layout for virtual keyboard)
         Jérémie Andréi (AZERTY keyboard layout, Array index fix, OSS failsafe)
         Alexis Ballier (const char* <-> string mismatch, NULLMidi prototype fix)
-        Tobias Doerffel (static vs instance variables alteration)
+        Tobias Doerffel (static-instance variables fix, missing include fix)
         James Morris (Memory leaks in FLTK GUI)
 
diff --git a/plugins/zynaddsubfx/src/Params/PADnoteParameters.h b/plugins/zynaddsubfx/src/Params/PADnoteParameters.h
index dde2c6499..37d598529 100644
--- a/plugins/zynaddsubfx/src/Params/PADnoteParameters.h
+++ b/plugins/zynaddsubfx/src/Params/PADnoteParameters.h
@@ -35,6 +35,7 @@
 #include "FilterParams.h"
 #include "Presets.h"
 #include <string>
+#include <pthread.h>
 
 class PADnoteParameters:public Presets
 {