diff --git a/libraries/AP_Param/AP_Param.cpp b/libraries/AP_Param/AP_Param.cpp
index f1c6d949f6..463b7f080a 100644
--- a/libraries/AP_Param/AP_Param.cpp
+++ b/libraries/AP_Param/AP_Param.cpp
@@ -2144,7 +2144,7 @@ bool AP_Param::parse_param_line(char *line, char **vname, float &value, bool &re
 }
 
 
-#if AP_PARAM_DEFAULTS_FILE_PARSING_ENABLED
+#if AP_PARAM_DEFAULTS_FILE_PARSING_ENABLED || AP_PARAM_DYNAMIC_ENABLED
 
 // increments num_defaults for each default found in filename
 bool AP_Param::count_defaults_in_file(const char *filename, uint16_t &num_defaults)