diff --git a/src/compiler/isaspec/isaspec_decode_decl.h b/src/compiler/isaspec/isaspec_decode_decl.h
index 968163e7212..b0028c6b149 100644
--- a/src/compiler/isaspec/isaspec_decode_decl.h
+++ b/src/compiler/isaspec/isaspec_decode_decl.h
@@ -56,8 +56,6 @@ typedef uint64_t (*isa_expr_t)(struct decode_scope *scope);
  */
 uint64_t isa_decode_field(struct decode_scope *scope, const char *field_name);
 
-void isa_decode_bitset(void *out, const struct isa_bitset **bitsets, struct decode_scope *scope, bitmask_t val);
-
 /**
  * Used by generated decode functions
  */
diff --git a/src/compiler/isaspec/isaspec_decode_impl.c b/src/compiler/isaspec/isaspec_decode_impl.c
index 5a7afc94c90..9ad6878d285 100644
--- a/src/compiler/isaspec/isaspec_decode_impl.c
+++ b/src/compiler/isaspec/isaspec_decode_impl.c
@@ -933,7 +933,7 @@ decode_bitset(void *out, struct decode_scope *scope)
 	}
 }
 
-void
+static void
 isa_decode_bitset(void *out, const struct isa_bitset **bitsets, struct decode_scope *scope, bitmask_t val)
 {
 	struct decode_state *state = scope->state;