diff --git a/rtengine/improccoordinator.cc b/rtengine/improccoordinator.cc
index cc2d75b3d..9437f1a75 100644
--- a/rtengine/improccoordinator.cc
+++ b/rtengine/improccoordinator.cc
@@ -163,6 +163,7 @@ ImProcCoordinator::ImProcCoordinator() :
     imageTypeListener(nullptr),
     filmNegListener(nullptr),
     actListener(nullptr),
+    primListener(nullptr),
     adnListener(nullptr),
     awavListener(nullptr),
     dehaListener(nullptr),