diff --git a/src/Solvers/RectangularDomain.cpp b/src/Solvers/RectangularDomain.cpp
index a2be643a3e00faa4452f68e824fce9708ab3ace4..314563af66844c2ddca06148d73faa1145215893 100644
--- a/src/Solvers/RectangularDomain.cpp
+++ b/src/Solvers/RectangularDomain.cpp
@@ -95,7 +95,7 @@ void RectangularDomain::getBoundaryStencil(int x, int y, int z, double &W,
 #ifdef DEBUG
     if (C <= 0)
         throw OpalException("RectangularDomain::getBoundaryStencil",
-                            "Stencil C is <= 0! This case should never occure!");
+                            "Stencil C is <= 0! This case should never occur!");
 #endif
 }