diff --git a/gcc/jit/jit-playback.c b/gcc/jit/jit-playback.c
index 59399dee251..b412eae6aa8 100644
--- a/gcc/jit/jit-playback.c
+++ b/gcc/jit/jit-playback.c
@@ -1484,7 +1484,8 @@ function (context *ctxt,
 : m_ctxt(ctxt),
   m_inner_fndecl (fndecl),
   m_inner_bind_expr (NULL),
-  m_kind (kind)
+  m_kind (kind),
+  m_blocks ()
 {
   if (m_kind != GCC_JIT_FUNCTION_IMPORTED)
     {