diff --git a/Makefile.am b/Makefile.am
index 0b824b7..87c2fb8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,7 +5,7 @@
 libfan_la_LIBADD = \
 	$(SDBUSPLUS_LIBS)
 libfan_la_CXXFLAGS =
-	$(SDBUSPLUS_CFLAGS)
+	$(SDBUSPLUS_CFLAGS) -flto
 libfan_la_SOURCES = \
 	utility.cpp \
 	timer.cpp
diff --git a/control/Makefile.am b/control/Makefile.am
index 09fb1a2..01ee9c9 100644
--- a/control/Makefile.am
+++ b/control/Makefile.am
@@ -24,7 +24,8 @@
 phosphor_fan_control_CXXFLAGS = \
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_LOGGING_CFLAGS) \
-	${PHOSPHOR_DBUS_INTERFACES_CFLAGS}
+	${PHOSPHOR_DBUS_INTERFACES_CFLAGS} \
+	-flto
 
 BUILT_SOURCES = fan_zone_defs.cpp
 
diff --git a/cooling-type/Makefile.am b/cooling-type/Makefile.am
index 869d463..68d6c2f 100644
--- a/cooling-type/Makefile.am
+++ b/cooling-type/Makefile.am
@@ -13,7 +13,8 @@
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_LOGGING_CFLAGS) \
 	$(LIBEVDEV_CFLAGS) \
-	${PHOSPHOR_DBUS_INTERFACES_CFLAGS}
+	${PHOSPHOR_DBUS_INTERFACES_CFLAGS} \
+	-flto
 
 phosphor_cooling_type_LDADD = \
 	${top_builddir}/libfan.la \
diff --git a/monitor/Makefile.am b/monitor/Makefile.am
index bea0933..cb9b8a4 100644
--- a/monitor/Makefile.am
+++ b/monitor/Makefile.am
@@ -26,7 +26,8 @@
 phosphor_fan_monitor_CXXFLAGS = \
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_LOGGING_CFLAGS) \
-	${PHOSPHOR_DBUS_INTERFACES_CFLAGS}
+	${PHOSPHOR_DBUS_INTERFACES_CFLAGS} \
+	-flto
 
 fan_monitor_defs.cpp: ${srcdir}/gen-fan-monitor-defs.py
 	$(AM_V_GEN)$(GEN_FAN_MONITOR_DEFS)
diff --git a/presence/Makefile.am b/presence/Makefile.am
index b51563d..eb4dd6c 100644
--- a/presence/Makefile.am
+++ b/presence/Makefile.am
@@ -23,7 +23,8 @@
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_LOGGING_CFLAGS) \
 	${PHOSPHOR_DBUS_INTERFACES_CFLAGS} \
-	$(LIBEVDEV_CFLAGS)
+	$(LIBEVDEV_CFLAGS) \
+	-flto
 
 BUILT_SOURCES = generated.hpp
 TEMPLATES = \