diff --git a/Makefile b/Makefile
index ce1a81d0..e9d14551 100644
--- a/Makefile
+++ b/Makefile
@@ -158,7 +158,7 @@ PAHO_CS_SUB_TARGET = ${blddir}/samples/${PAHO_CS_SUB_NAME}
 #FLAGS_EXE = $(LDFLAGS) -I ${srcdir} -lpthread -L ${blddir}
 #FLAGS_EXES = $(LDFLAGS) -I ${srcdir} ${START_GROUP} -lpthread -lssl -lcrypto ${END_GROUP} -L ${blddir}
 
-CCFLAGS_SO = -g -fPIC $(CFLAGS) -D_GNU_SOURCE -Os -Wall -fvisibility=hidden -I$(blddir_work) -DMQTT_EXPORTS=1
+CCFLAGS_SO = -g -fPIC $(CFLAGS) -D_GNU_SOURCE -Os -Wall -fvisibility=hidden -I$(blddir_work) -DPAHO_MQTT_EXPORTS=1
 FLAGS_EXE = $(LDFLAGS) -I ${srcdir} ${START_GROUP} -lpthread ${GAI_LIB} ${END_GROUP} -L ${blddir}
 FLAGS_EXES = $(LDFLAGS) -I ${srcdir} ${START_GROUP} -lpthread ${GAI_LIB} -lssl -lcrypto ${END_GROUP} -L ${blddir}