diff --git a/test/pargen/psb_d_pde2d.f90 b/test/pargen/psb_d_pde2d.f90
index 94bd77c4..dc3055e1 100644
--- a/test/pargen/psb_d_pde2d.f90
+++ b/test/pargen/psb_d_pde2d.f90
@@ -223,7 +223,7 @@ contains
       f_ => d_null_func_2d
     end if
 
-    deltah   = done/(idim+2)
+    deltah   = done/(idim+1)
     sqdeltah = deltah*deltah
     deltah2  = (2*done)* deltah
 
diff --git a/test/pargen/psb_d_pde3d.f90 b/test/pargen/psb_d_pde3d.f90
index 5f723f32..e34636a4 100644
--- a/test/pargen/psb_d_pde3d.f90
+++ b/test/pargen/psb_d_pde3d.f90
@@ -238,7 +238,7 @@ contains
       f_ => d_null_func_3d
     end if
 
-    deltah   = done/(idim+2)
+    deltah   = done/(idim+1)
     sqdeltah = deltah*deltah
     deltah2  = (2*done)* deltah
 
diff --git a/test/pargen/psb_s_pde2d.f90 b/test/pargen/psb_s_pde2d.f90
index 1f6ea8eb..c16d8843 100644
--- a/test/pargen/psb_s_pde2d.f90
+++ b/test/pargen/psb_s_pde2d.f90
@@ -223,7 +223,7 @@ contains
       f_ => s_null_func_2d
     end if
 
-    deltah   = sone/(idim+2)
+    deltah   = sone/(idim+1)
     sqdeltah = deltah*deltah
     deltah2  = (2*sone)* deltah
 
diff --git a/test/pargen/psb_s_pde3d.f90 b/test/pargen/psb_s_pde3d.f90
index a74d414b..1a950384 100644
--- a/test/pargen/psb_s_pde3d.f90
+++ b/test/pargen/psb_s_pde3d.f90
@@ -238,7 +238,7 @@ contains
       f_ => s_null_func_3d
     end if
 
-    deltah   = sone/(idim+2)
+    deltah   = sone/(idim+1)
     sqdeltah = deltah*deltah
     deltah2  = (2*sone)* deltah