diff --git a/pandatool/src/assimp/pandaLogger.cxx b/pandatool/src/assimp/pandaLogger.cxx
index 2b92cfbc17..04745e2bc8 100644
--- a/pandatool/src/assimp/pandaLogger.cxx
+++ b/pandatool/src/assimp/pandaLogger.cxx
@@ -38,6 +38,15 @@ void PandaLogger::OnDebug(const char *message) {
   assimp_cat.debug() << message << "\n";
 }
 
+/**
+ *
+ */
+void PandaLogger::OnVerboseDebug(const char *message) {
+  if (assimp_cat.is_spam()) {
+    assimp_cat.spam() << message << "\n";
+  }
+}
+
 /**
  *
  */
diff --git a/pandatool/src/assimp/pandaLogger.h b/pandatool/src/assimp/pandaLogger.h
index dbd2165ce6..2fdbd44609 100644
--- a/pandatool/src/assimp/pandaLogger.h
+++ b/pandatool/src/assimp/pandaLogger.h
@@ -30,11 +30,17 @@ protected:
   INLINE bool attachStream(Assimp::LogStream*, unsigned int) {
     return false;
   };
+  INLINE bool detachStream(Assimp::LogStream*, unsigned int) {
+    return false;
+  };
+
+  // Kept for compatibility with Assimp 4.x
   INLINE bool detatchStream(Assimp::LogStream*, unsigned int) {
     return false;
   };
 
   void OnDebug(const char *message);
+  void OnVerboseDebug(const char *message);
   void OnError(const char *message);
   void OnInfo(const char *message);
   void OnWarn(const char *message);