diff --git a/theories/heap_lang/lib/lock.v b/theories/heap_lang/lib/lock.v
index 5796f1f917d042e881c67e3ecd5177eaa6a0dc99..720dcc19aa4af6c4696ed456ae0167c6f797ac7d 100644
--- a/theories/heap_lang/lib/lock.v
+++ b/theories/heap_lang/lib/lock.v
@@ -26,8 +26,6 @@ Structure lock Σ `{!heapG Σ} := Lock {
     {{{ is_lock N γ lk R ∗ locked γ ∗ R }}} release lk {{{ RET #(); True }}}
 }.
 
-
-
 Arguments newlock {_ _} _.
 Arguments acquire {_ _} _.
 Arguments release {_ _} _.