diff --git a/source/blender/compositor/intern/COM_CompositorContext.cc b/source/blender/compositor/intern/COM_CompositorContext.cc
index e2447fb5c13..a746ccbc09f 100644
--- a/source/blender/compositor/intern/COM_CompositorContext.cc
+++ b/source/blender/compositor/intern/COM_CompositorContext.cc
@@ -20,6 +20,8 @@
 #include "COM_defines.h"
 #include <cstdio>
 
+#include "BLI_assert.h"
+
 CompositorContext::CompositorContext()
 {
   this->m_scene = nullptr;
@@ -33,9 +35,6 @@ CompositorContext::CompositorContext()
 
 int CompositorContext::getFramenumber() const
 {
-  if (this->m_rd) {
-    return this->m_rd->cfra;
-  }
-
-  return -1; /* this should never happen */
+  BLI_assert(m_rd);
+  return m_rd->cfra;
 }