diff --git a/src/ca/Makefile.Unix b/src/ca/Makefile.Unix
index e1d5d6a0f..1304af34b 100644
--- a/src/ca/Makefile.Unix
+++ b/src/ca/Makefile.Unix
@@ -3,7 +3,7 @@ include Target.include
 include $(EPICS)/config/CONFIG_BASE
 
 USR_CFLAGS = -DACCESS_SECURITY -D_NO_PROTO
-USR_LDLIBS = -lca -lCom
+USR_LDLIBS = -lca -lCom -lm
 USR_LDFLAGS = -L.
 
 DEPLIBS_BASE = $(EPICS_BASE_LIB)
diff --git a/src/db/Makefile.Unix b/src/db/Makefile.Unix
index daf9b5376..134a470c7 100644
--- a/src/db/Makefile.Unix
+++ b/src/db/Makefile.Unix
@@ -2,7 +2,7 @@ EPICS = ../../../..
 include Target.include
 include $(EPICS)/config/CONFIG_BASE
 
-USR_LDLIBS = -lDb -lCom
+USR_LDLIBS = -lDb -lCom -lm
 USR_LDFLAGS = -L.
 
 LEX = $(ELEX)