diff --git a/Instance/application.make b/Instance/application.make
index e11e3728..c33cd612 100644
--- a/Instance/application.make
+++ b/Instance/application.make
@@ -232,7 +232,7 @@ MAIN_STORYBOARD_FILE = $(strip $(subst .storyboard,,$($(GNUSTEP_INSTANCE)_MAIN_S
 # inside GNUSTEP_STAMP_DIR, and rebuild Info.plist if
 # GNUSTEP_STAMP_STRING changes.  We will also depend on xxxInfo.plist
 # if any.
-GNUSTEP_STAMP_STRING = $(PRINCIPAL_CLASS)-$(APPLICATION_ICON)-$(MAIN_MODEL_FILE)-$(MAIN_MARKUP_FILE)
+GNUSTEP_STAMP_STRING = $(PRINCIPAL_CLASS)-$(APPLICATION_ICON)-$(MAIN_MODEL_FILE)-$(MAIN_MARKUP_FILE)-$(MAIN_STORYBOARD_FILE)
 
 ifneq ($(FOUNDATION_LIB),apple)
 GNUSTEP_STAMP_DIR = $(APP_DIR)