diff --git a/src/tool_getparam.h b/src/tool_getparam.h
index 23628c00f155c14d03dd88cdcbdd6b6c503ca351..a13ce6d90153eba0985fd3ebe7a5dfb9304fcfe1 100644
--- a/src/tool_getparam.h
+++ b/src/tool_getparam.h
@@ -41,6 +41,7 @@ typedef enum {
   PARAM_LAST
 } ParameterError;
 
+struct GlobalConfig;
 struct OperationConfig;
 
 ParameterError getparameter(char *flag,