diff --git a/modules/seq/base/src/hmm.hh b/modules/seq/base/src/hmm.hh
index 68b83db1e666c15e4761a4c682ae3833b1287fa5..357fc71159243384d41b474a65a50517bdba0dfb 100644
--- a/modules/seq/base/src/hmm.hh
+++ b/modules/seq/base/src/hmm.hh
@@ -1,6 +1,7 @@
 #ifndef OST_SEQ_HMM_HH
 #define OST_SEQ_HMM_HH
 
+#include <stdint.h>
 #include <string>
 #include <vector>
 #include <map>