diff --git a/api/bdw-attrs.h b/api/bdw-attrs.h
index 7a68618cc..0f97c1340 100644
--- a/api/bdw-attrs.h
+++ b/api/bdw-attrs.h
@@ -92,4 +92,8 @@ static inline int gc_can_pin_objects(void) {
   return 1;
 }
 
+static inline int gc_can_move_objects(void) {
+  return 0;
+}
+
 #endif // BDW_ATTRS_H
diff --git a/api/gc-attrs.h b/api/gc-attrs.h
index 1ce2c854b..eaba7f8bc 100644
--- a/api/gc-attrs.h
+++ b/api/gc-attrs.h
@@ -65,6 +65,7 @@ enum gc_cooperative_safepoint_kind {
 static inline enum gc_cooperative_safepoint_kind gc_cooperative_safepoint_kind(void) GC_ALWAYS_INLINE;
 
 static inline int gc_can_pin_objects(void) GC_ALWAYS_INLINE;
+static inline int gc_can_move_objects(void) GC_ALWAYS_INLINE;
 
 #ifndef GC_IMPL
 #ifdef GC_ATTRS
diff --git a/api/mmc-attrs.h b/api/mmc-attrs.h
index 6e9b6487d..749674343 100644
--- a/api/mmc-attrs.h
+++ b/api/mmc-attrs.h
@@ -117,4 +117,8 @@ static inline int gc_can_pin_objects(void) {
   return 1;
 }
 
+static inline int gc_can_move_objects(void) {
+  return GC_CONSERVATIVE_TRACE ? 0 : 1;
+}
+
 #endif // MMC_ATTRS_H
diff --git a/api/pcc-attrs.h b/api/pcc-attrs.h
index d7ec30768..905b5cd05 100644
--- a/api/pcc-attrs.h
+++ b/api/pcc-attrs.h
@@ -89,4 +89,8 @@ static inline int gc_can_pin_objects(void) {
   return 0;
 }
 
+static inline int gc_can_move_objects(void) {
+  return 1;
+}
+
 #endif // PCC_ATTRS_H
diff --git a/api/semi-attrs.h b/api/semi-attrs.h
index fb4d7ab91..c04de3a0d 100644
--- a/api/semi-attrs.h
+++ b/api/semi-attrs.h
@@ -78,4 +78,8 @@ static inline int gc_can_pin_objects(void) {
   return 0;
 }
 
+static inline int gc_can_move_objects(void) {
+  return 1;
+}
+
 #endif // SEMI_ATTRS_H