diff --git a/libraries/AP_Param/AP_Param.cpp b/libraries/AP_Param/AP_Param.cpp
index 7952f5bf72..c29871e44c 100644
--- a/libraries/AP_Param/AP_Param.cpp
+++ b/libraries/AP_Param/AP_Param.cpp
@@ -2149,7 +2149,7 @@ bool AP_Param::parse_param_line(char *line, char **vname, float &value, bool &re
 }
 
 
-#if HAL_OS_POSIX_IO == 1
+#if HAVE_FILESYSTEM_SUPPORT
 
 // increments num_defaults for each default found in filename
 bool AP_Param::count_defaults_in_file(const char *filename, uint16_t &num_defaults)
@@ -2290,7 +2290,7 @@ bool AP_Param::load_defaults_file(const char *filename, bool last_pass)
     return true;
 }
 
-#endif // HAL_OS_POSIX_IO
+#endif // HAVE_FILESYSTEM_SUPPORT
 
 #if AP_PARAM_MAX_EMBEDDED_PARAM > 0
 /*
diff --git a/libraries/AP_Param/AP_Param.h b/libraries/AP_Param/AP_Param.h
index bf2d79333e..2d56e90386 100644
--- a/libraries/AP_Param/AP_Param.h
+++ b/libraries/AP_Param/AP_Param.h
@@ -547,6 +547,8 @@ public:
     static bool load_int32(uint16_t key, uint32_t group_element, int32_t &value);
 #endif
 
+    static bool load_defaults_file(const char *filename, bool last_pass);
+
 protected:
 
     // store default value in linked list
@@ -696,14 +698,11 @@ private:
 
     static bool parse_param_line(char *line, char **vname, float &value, bool &read_only);
 
-#if HAL_OS_POSIX_IO == 1
     /*
       load a parameter defaults file. This happens as part of load_all()
      */
     static bool count_defaults_in_file(const char *filename, uint16_t &num_defaults);
     static bool read_param_defaults_file(const char *filename, bool last_pass);
-    static bool load_defaults_file(const char *filename, bool last_pass);
-#endif
 
     /*
       load defaults from embedded parameters