diff --git a/pcbnew/plugins/kicad/kicad_plugin.h b/pcbnew/plugins/kicad/kicad_plugin.h
index 017eb9de46..7acf5b8dc5 100644
--- a/pcbnew/plugins/kicad/kicad_plugin.h
+++ b/pcbnew/plugins/kicad/kicad_plugin.h
@@ -95,7 +95,8 @@ class PCB_TEXT;
 //#define SEXPR_BOARD_FILE_VERSION    20201220  // Add free via token
 //#define SEXPR_BOARD_FILE_VERSION    20210108  // Pad locking moved from footprint to pads
 //#define SEXPR_BOARD_FILE_VERSION    20210126  // Store pintype alongside pinfunction (in pads).
-#define SEXPR_BOARD_FILE_VERSION      20210228  // Move global margins back to board file
+//#define SEXPR_BOARD_FILE_VERSION      20210228  // Move global margins back to board file
+#define SEXPR_BOARD_FILE_VERSION      20210424  // Correct locked flag syntax (remove parens).
 
 #define BOARD_FILE_HOST_VERSION       20200825  ///< Earlier files than this include the host tag