diff --git a/autoload/ale/handlers.vim b/autoload/ale/handlers.vim
index 93282a4..96be427 100644
--- a/autoload/ale/handlers.vim
+++ b/autoload/ale/handlers.vim
@@ -258,7 +258,8 @@ function! ale#handlers#HandleGhcFormat(buffer, lines) abort
         else
           let l:type = ''
           let l:text = l:match[3]
-        end
+        endif
+
         let l:type = l:type ==# '' ? 'E' : toupper(l:type[0])
 
         call add(l:output, {
diff --git a/custom-checks b/custom-checks
index 798049e..0a1c96f 100755
--- a/custom-checks
+++ b/custom-checks
@@ -67,6 +67,12 @@ check_line() {
     if [[ "$line" =~ ' '+$ ]]; then
         output_error 'Trailing whitespace'
     fi
+
+    endif_regex='^ * end?i? *$'
+
+    if [[ "$line" =~ $endif_regex ]]; then
+        output_error 'Write endif, not en, end, or endi'
+    fi
 }
 
 # Loop through all of the vim files and keep track of the file line numbers.