diff --git a/opm/core/pressure/fsh.h b/opm/core/pressure/fsh.h
index 8e71e9c4..08cfebc5 100644
--- a/opm/core/pressure/fsh.h
+++ b/opm/core/pressure/fsh.h
@@ -18,7 +18,7 @@
 */
 
 #ifndef OPM_FSH_HEADER_INCLUDED
-#define OPM_FHS_HEADER_INCLUDED
+#define OPM_FSH_HEADER_INCLUDED
 
 /**
  * \file