diff --git a/cplusplus/VImage.cpp b/cplusplus/VImage.cpp
index 4b8b34f2..30899e6c 100644
--- a/cplusplus/VImage.cpp
+++ b/cplusplus/VImage.cpp
@@ -461,7 +461,7 @@ VImage::call_option_string( const char *operation_name,
 {
 	VipsOperation *operation;
 
-	VIPS_DEBUG_MSG( "vips_call_by_name: starting for %s ...\n", 
+	VIPS_DEBUG_MSG( "call_option_string: starting for %s ...\n", 
 		operation_name );
 
 	if( !(operation = vips_operation_new( operation_name )) ) {