diff --git a/test/pargen/psb_d_pde2d.f90 b/test/pargen/psb_d_pde2d.f90
index 0fd31807..4b8b6584 100644
--- a/test/pargen/psb_d_pde2d.f90
+++ b/test/pargen/psb_d_pde2d.f90
@@ -227,7 +227,7 @@ 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 21b7cc8b..429e9a0e 100644
--- a/test/pargen/psb_d_pde3d.f90
+++ b/test/pargen/psb_d_pde3d.f90
@@ -243,7 +243,7 @@ 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 224de175..b0fe9a7e 100644
--- a/test/pargen/psb_s_pde2d.f90
+++ b/test/pargen/psb_s_pde2d.f90
@@ -227,7 +227,7 @@ 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 8483fe92..e7c7725e 100644
--- a/test/pargen/psb_s_pde3d.f90
+++ b/test/pargen/psb_s_pde3d.f90
@@ -243,7 +243,7 @@ contains
       f_ => s_null_func_3d
     end if
 
-    deltah   = sone/(idim+2)
+    deltah   = sone/(idim+1)
     sqdeltah = deltah*deltah
     deltah2  = (2*sone)* deltah