diff --git a/src/ppm_mg_core.f b/src/ppm_mg_core.f
index 269ebb7715a2be6961a3b11a3331aeb7eda71f32..17a49f813c6ec2becfafb8c1c6e4ba794653e6b0 100644
--- a/src/ppm_mg_core.f
+++ b/src/ppm_mg_core.f
@@ -67,8 +67,8 @@
         !-----------------------------------------------------------------------
         USE ppm_module_data
         USE ppm_module_data_mg
-        USE ppm_module_mg_prolong 
-        USE ppm_module_mg_restrict 
+        USE ppm_module_mg_prolong
+        USE ppm_module_mg_restrict
         USE ppm_module_mg_smooth
         USE ppm_module_mg_res
         USE ppm_module_substart
diff --git a/src/ppm_mg_init.f b/src/ppm_mg_init.f
index fafb138b13b8f40b4e5ec010e63c5755c0ec1fcd..9b92f80137db735644cdd67d4e0aacf39c1c2e35 100644
--- a/src/ppm_mg_init.f
+++ b/src/ppm_mg_init.f
@@ -146,7 +146,7 @@
         USE ppm_module_error
         USE ppm_module_mesh_derive
         USE ppm_module_substart
-        USE ppm_module_substop 
+        USE ppm_module_substop
         USE ppm_module_typedef
 
         IMPLICIT NONE
diff --git a/src/ppm_mg_solv.f b/src/ppm_mg_solv.f
index c5cd3f6123b723becdfda96ec481220b08647b7e..fbd83e8e698104178e8b26c1e42096c3e40ebfad 100644
--- a/src/ppm_mg_solv.f
+++ b/src/ppm_mg_solv.f
@@ -124,8 +124,8 @@
         USE ppm_module_map
         USE ppm_module_mg_core
         USE ppm_module_mg_res
-        USE ppm_module_mg_prolong         
-        USE ppm_module_mg_smooth         
+        USE ppm_module_mg_prolong
+        USE ppm_module_mg_smooth
         USE ppm_module_write
 
         IMPLICIT NONE