diff --git a/ext/bigdecimal/depend b/ext/bigdecimal/depend
index d006cdef37..5a52977531 100644
--- a/ext/bigdecimal/depend
+++ b/ext/bigdecimal/depend
@@ -165,5 +165,6 @@ bigdecimal.o: bigdecimal.c
 bigdecimal.o: bigdecimal.h
 bigdecimal.o: bits.h
 bigdecimal.o: feature.h
+bigdecimal.o: missing.h
 bigdecimal.o: static_assert.h
 # AUTOGENERATED DEPENDENCIES END