diff --git a/go/escape.cc b/go/escape.cc
index 8962f3f..cf68874 100644
--- a/go/escape.cc
+++ b/go/escape.cc
@@ -363,8 +363,6 @@
 		  op << "append";
 		  break;
 
-		case Runtime::SLICECOPY:
-		case Runtime::SLICESTRINGCOPY:
 		case Runtime::TYPEDSLICECOPY:
 		  op << "copy";
 		  break;
diff --git a/go/runtime.def b/go/runtime.def
index 7ab94a3..ec01be0 100644
--- a/go/runtime.def
+++ b/go/runtime.def
@@ -242,14 +242,6 @@
 DEF_GO_RUNTIME(CLOSE, "runtime.closechan", P1(CHAN), R0())
 
 
-// Copy.
-DEF_GO_RUNTIME(SLICECOPY, "runtime.slicecopy",
-	       P5(POINTER, INT, POINTER, INT, UINTPTR), R1(INT))
-
-// Copy from string.
-DEF_GO_RUNTIME(SLICESTRINGCOPY, "runtime.slicestringcopy",
-	       P3(POINTER, INT, STRING), R1(INT))
-
 // Copy of value containing pointers.
 DEF_GO_RUNTIME(TYPEDSLICECOPY, "runtime.typedslicecopy",
 	       P5(TYPE, POINTER, INT, POINTER, INT), R1(INT))