diff --git a/core/definitions.mk b/core/definitions.mk
index 909357ce2b..b6b0d69ed2 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -3422,6 +3422,10 @@ endef
 # $(2): path in symbols directory
 # $(3): file type (elf or r8)
 # $(4): path in the mappings directory
+#
+# Regarding the restats at the end: I think you should only need to use KATI_RESTAT on $(2), but
+# there appears to be a bug in kati where it was not adding restat=true in the ninja file unless we
+# also added 4 to KATI_RESTAT.
 define _copy-symbols-file-with-mapping
 $(2): .KATI_IMPLICIT_OUTPUTS := $(4)
 $(2): $(SYMBOLS_MAP)
@@ -3430,6 +3434,7 @@ $(2): $(1)
 	$$(copy-file-to-target)
 	$(SYMBOLS_MAP) -$(strip $(3)) $(2) -write_if_changed $(4)
 .KATI_RESTAT: $(2)
+.KATI_RESTAT: $(4)
 endef