diff --git a/ipaacalib/cpp/include/ipaaca/ipaaca.h b/ipaacalib/cpp/include/ipaaca/ipaaca.h
index a6504a6e2c3a64aef7f1d9d12b4480ff0d5a3b1e..21b43a797f35f106d6a18ca9f364e712d97df0e5 100644
--- a/ipaacalib/cpp/include/ipaaca/ipaaca.h
+++ b/ipaacalib/cpp/include/ipaaca/ipaaca.h
@@ -57,6 +57,8 @@
 #include <pthread.h>
 #include <uuid/uuid.h>
 
+#include <set>
+
 namespace ipaaca {
 
 typedef uint32_t revision_t;