diff --git a/src/as/Makefile b/src/as/Makefile
index 72f63047d..3f7196d6d 100644
--- a/src/as/Makefile
+++ b/src/as/Makefile
@@ -16,6 +16,7 @@ INC += asCa.h
 INC += asTrapWrite.h
 
 LIB_SRCS += asLib.c
+LIB_SRCS += asTrapWrite.c
 
 asIoc_SRCS += asDbLib.c
 asIoc_SRCS += asCa.c