3 files changed, 5 insertions, 3 deletions
diff --git a/grammar.c b/grammar.c
index aa75522..5284225 100644
--- a/grammar.c
+++ b/grammar.c
@@ -94,7 +94,7 @@ void push_backref(grammar_t *g, const char *name, match_t *capture)
     op->start = capture->start;
     op->end = capture->end;
     op->len = -1; // TODO: maybe calculate this?
-    op->args.backref = (void*)capture;
+    op->args.backref = capture;
     g->backrefs[i].op = op;
 }
 
diff --git a/types.h b/types.h
index 56c6e28..e497c44 100644
--- a/types.h
+++ b/types.h
@@ -41,6 +41,8 @@ enum VMOpcode {
     VM_NODENT,
 };
 
+struct match_s; // forward declared to resolve circular struct defs
+
 /*
  * A struct reperesenting a BP virtual machine operation
  */
@@ -71,7 +73,7 @@ typedef struct vm_op_s {
             struct vm_op_s *capture_pat;
             char *name;
         } capture;
-        void *backref;
+        struct match_s *backref;
         struct vm_op_s *pat;
     } args;
 } vm_op_t;
diff --git a/vm.c b/vm.c
index b81fd2c..55c25fb 100644
--- a/vm.c
+++ b/vm.c
@@ -458,7 +458,7 @@ static match_t *_match(grammar_t *g, file_t *f, const char *str, vm_op_t *op, un
             return m;
         }
         case VM_BACKREF: {
-            return match_backref(str, op, (match_t*)op->args.backref, flags);
+            return match_backref(str, op, op->args.backref, flags);
         }
         case VM_NODENT: {
             if (*str != '\n') return NULL;