diff --git a/examples/web_server/Makefile b/examples/web_server/Makefile
index 888f2148..ba3a2084 100644
--- a/examples/web_server/Makefile
+++ b/examples/web_server/Makefile
@@ -2,7 +2,7 @@
 # All rights reserved
 
 PROG = web_server
-CFLAGS = -W -Wall -I../.. -pthread -g -O0 $(CFLAGS_EXTRA)
+CFLAGS = -W -Wall -I../.. -pthread -g -O0 -DMONGOOSE_ENABLE_THREADS $(CFLAGS_EXTRA)
 SOURCES = $(PROG).c ../../mongoose.c
 
 $(PROG): $(SOURCES)
diff --git a/examples/websocket_ssl_proxy/Makefile b/examples/websocket_ssl_proxy/Makefile
index e69af861..968f1aca 100644
--- a/examples/websocket_ssl_proxy/Makefile
+++ b/examples/websocket_ssl_proxy/Makefile
@@ -2,7 +2,7 @@
 # All rights reserved
 
 PROG = ws_ssl
-CFLAGS = -W -Wall -I../.. -I. -pthread -g -O0 -DNS_ENABLE_SSL -DSSL_WRAPPER_USE_AS_LIBRARY $(CFLAGS_EXTRA)
+CFLAGS = -W -Wall -I../.. -I. -pthread -g -O0 -DMONGOOSE_ENABLE_THREADS -DNS_ENABLE_SSL -DSSL_WRAPPER_USE_AS_LIBRARY $(CFLAGS_EXTRA)
 LDFLAGS = -lssl
 SOURCES = ws_ssl.c ../../mongoose.c ssl_wrapper.c