diff --git a/compiler/utils/assembler.cc b/compiler/utils/assembler.cc
index 68b784a..e3045e1 100644
--- a/compiler/utils/assembler.cc
+++ b/compiler/utils/assembler.cc
@@ -92,6 +92,7 @@
 
   // Compute the relocation delta and switch to the new contents area.
   ptrdiff_t delta = new_contents - contents_;
+  delete[] contents_;
   contents_ = new_contents;
 
   // Update the cursor and recompute the limit.