diff --git a/Source/hydro/riemann_constants.H b/Source/hydro/riemann_constants.H
index ad8fa2a141..b29b92e2a5 100644
--- a/Source/hydro/riemann_constants.H
+++ b/Source/hydro/riemann_constants.H
@@ -1,5 +1,5 @@
-#ifndef RIEMANN_CONSTANTS
-#define RIEMANN_CONSTANTS
+#ifndef RIEMANN_CONSTANTS_H
+#define RIEMANN_CONSTANTS_H
 
 #include <AMReX_REAL.H>