diff --git a/src/cmd/link/internal/ld/config.go b/src/cmd/link/internal/ld/config.go
index f91d9af5cd..ce4f9bece6 100644
--- a/src/cmd/link/internal/ld/config.go
+++ b/src/cmd/link/internal/ld/config.go
@@ -190,7 +190,8 @@ func mustLinkExternal(ctxt *Link) (res bool, reason string) {
 	// Internally linking cgo is incomplete on some architectures.
 	// https://golang.org/issue/10373
 	// https://golang.org/issue/14449
-	if iscgo && SysArch.InFamily(sys.ARM64, sys.MIPS64, sys.MIPS) {
+	// https://golang.org/issue/21961
+	if iscgo && SysArch.InFamily(sys.ARM64, sys.MIPS64, sys.MIPS, sys.PPC64) {
 		return true, objabi.GOARCH + " does not support internal cgo"
 	}
 
diff --git a/src/cmd/nm/nm_cgo_test.go b/src/cmd/nm/nm_cgo_test.go
index 4e67560e2e..b32402069a 100644
--- a/src/cmd/nm/nm_cgo_test.go
+++ b/src/cmd/nm/nm_cgo_test.go
@@ -17,7 +17,7 @@ func canInternalLink() bool {
 		return false
 	case "linux":
 		switch runtime.GOARCH {
-		case "arm64", "mips64", "mips64le", "mips", "mipsle":
+		case "arm64", "mips64", "mips64le", "mips", "mipsle", "ppc64", "ppc64le":
 			return false
 		}
 	}