diff --git a/Problem01.hs b/Problem01.hs
index 4ddee01..e53286c 100644
--- a/Problem01.hs
+++ b/Problem01.hs
@@ -1,4 +1,4 @@
-module Problem1 where
+module Problem01 where
 
 -- Problem 1
 -- Find the last element of a list.
diff --git a/Problem02.hs b/Problem02.hs
index c107b14..c452eb5 100644
--- a/Problem02.hs
+++ b/Problem02.hs
@@ -1,4 +1,4 @@
-module Problem2 where
+module Problem02 where
 
 -- Problem 2
 -- Find the last but one element of a list.
diff --git a/Problem03.hs b/Problem03.hs
index 00eeb37..5142ac0 100644
--- a/Problem03.hs
+++ b/Problem03.hs
@@ -1,4 +1,4 @@
-module Problem3 where
+module Problem03 where
 
 -- Problem 3
 -- Find the K'th element of a list. The first element in the list is number 1.
diff --git a/Problem04.hs b/Problem04.hs
index bae0f0d..71e66b2 100644
--- a/Problem04.hs
+++ b/Problem04.hs
@@ -1,4 +1,4 @@
-module Problem4 where
+module Problem04 where
 
 -- Problem 4
 -- Find the number of elements of a list.
diff --git a/Problem05.hs b/Problem05.hs
index 1bfea15..b490ec0 100644
--- a/Problem05.hs
+++ b/Problem05.hs
@@ -1,4 +1,4 @@
-module Problem5 where
+module Problem05 where
 
 import DList
 
diff --git a/Problem06.hs b/Problem06.hs
index f05a36b..cf4e0d5 100644
--- a/Problem06.hs
+++ b/Problem06.hs
@@ -1,4 +1,4 @@
-module Problem6 where
+module Problem06 where
 
 import Problem5 (myReverse)
 
diff --git a/Problem07.hs b/Problem07.hs
index 7964007..08c6e63 100644
--- a/Problem07.hs
+++ b/Problem07.hs
@@ -1,4 +1,4 @@
-module Problem7 where
+module Problem07 where
 
 -- Problem 7
 -- Flatten a nested list structure.
diff --git a/Problem08.hs b/Problem08.hs
index 0d4c604..16aa2a6 100644
--- a/Problem08.hs
+++ b/Problem08.hs
@@ -1,4 +1,4 @@
-module Problem8 where
+module Problem08 where
 
 -- Problem 8
 -- Eliminate consecutive duplicates of list elements.
diff --git a/Problem09.hs b/Problem09.hs
index 3fb9ecf..2cba524 100644
--- a/Problem09.hs
+++ b/Problem09.hs
@@ -1,4 +1,4 @@
-module Problem9 where 
+module Problem09 where 
 
 import Data.List (group)