diff --git a/acc/mhd_solver/stencil_process.sps b/acc/mhd_solver/stencil_process.sps
index 9cf7aa6..574734f 100644
--- a/acc/mhd_solver/stencil_process.sps
+++ b/acc/mhd_solver/stencil_process.sps
@@ -4,7 +4,7 @@ uniform Scalar nu_visc;
 uniform Scalar cp_sound;
 uniform Scalar cv_sound;
 uniform Scalar mu0;
-unicalar eta;
+uniform Scalar eta;
 uniform Scalar gamma;
 uniform Scalar zeta;