diff --git a/src/stdlib_sorting.fypp b/src/stdlib_sorting.fypp
index 0dd385459..a078bfc2e 100644
--- a/src/stdlib_sorting.fypp
+++ b/src/stdlib_sorting.fypp
@@ -661,23 +661,23 @@ contains
             ${ti}$, intent(out), optional            :: iwork(0:)
             logical, intent(in), optional             :: reverse
 
-        integer(int_index) :: array_size, i
+            integer(int_index) :: array_size, i
 
-        array_size = size(array, kind=int_index)
+            array_size = size(array, kind=int_index)
 
-        if ( array_size > huge(index)) then
-            error stop "Too many entries for the kind of index."
-        end if
+            if ( array_size > huge(index)) then
+                error stop "Too many entries for the kind of index."
+            end if
 
-        if ( array_size > size(index, kind=int_index) ) then
-            error stop "Too many entries for the size of index."
-        end if
+            if ( array_size > size(index, kind=int_index) ) then
+                error stop "Too many entries for the size of index."
+            end if
 
-        do i = 0, array_size-1
-            index(i) = int(i+1, kind=${ki}$)
-        end do
+            do i = 0, array_size-1
+                index(i) = int(i+1, kind=${ki}$)
+            end do
 
-        call sort_adj(array, index, work, iwork, reverse)
+            call sort_adj(array, index, work, iwork, reverse)
 
         end subroutine ${name1}$_sort_index_${namei}$