diff --git a/src/system/sbrk.c b/src/system/sbrk.c
--- a/src/system/sbrk.c
+++ b/src/system/sbrk.c
@@ -6,17 +6,17 @@
 
 caddr_t _sbrk(int incr)
 {
-extern char end asm("end");
-static char *heap_end;
-char *prev_heap_end;
+    extern char end asm("end");
+    static char *heap_end;
+    char *prev_heap_end;
 
-if (heap_end == 0) {
-heap_end = &end;
+    if (heap_end == 0) {
+        heap_end = &end;
+    }
+
+    prev_heap_end = heap_end;
+
+    heap_end += incr;
+
+    return (caddr_t)prev_heap_end;
 }
-
-prev_heap_end = heap_end;
-
-heap_end += incr;
-
-return (caddr_t)prev_heap_end;
-}