diff --git a/src/as/Makefile.Unix b/src/as/Makefile.Unix
index 9520e7743..427163df0 100644
--- a/src/as/Makefile.Unix
+++ b/src/as/Makefile.Unix
@@ -3,7 +3,7 @@ include Target.include
 include $(EPICS)/config/CONFIG_BASE
 
 USR_CFLAGS = -D_NO_PROTO
-USR_LDLIBS = -lAs -lCom -lDb -lCom -s
+USR_LDLIBS = -lAs -lCom -lDb -lCom -lm -s
 USR_LDFLAGS = -L.
 
 DEPLIBS_BASE = $(EPICS_BASE_LIB)