diff --git a/source/adios2/engine/campaign/CampaignData.h b/source/adios2/engine/campaign/CampaignData.h
index 8cf4df2bc3..b1f221a280 100644
--- a/source/adios2/engine/campaign/CampaignData.h
+++ b/source/adios2/engine/campaign/CampaignData.h
@@ -12,6 +12,7 @@
 #ifndef ADIOS2_ENGINE_CAMPAIGNDATA_H_
 #define ADIOS2_ENGINE_CAMPAIGNDATA_H_
 
+#include <cstdint>
 #include <fstream>
 #include <iostream>
 #include <map>