diff --git a/src/cmd/compile/internal/gc/lex.go b/src/cmd/compile/internal/gc/lex.go
index 27ad9b56151..e05b454805f 100644
--- a/src/cmd/compile/internal/gc/lex.go
+++ b/src/cmd/compile/internal/gc/lex.go
@@ -75,7 +75,7 @@ func pragmaValue(verb string) syntax.Pragma {
 	case "go:yeswritebarrierrec":
 		return Yeswritebarrierrec
 	case "go:cgo_unsafe_args":
-		return CgoUnsafeArgs
+		return CgoUnsafeArgs | NoCheckPtr // implies NoCheckPtr (see #34968)
 	case "go:uintptrescapes":
 		// For the next function declared in the file
 		// any uintptr arguments may be pointer values
diff --git a/test/fixedbugs/issue34968.go b/test/fixedbugs/issue34968.go
new file mode 100644
index 00000000000..6b1dbd16edd
--- /dev/null
+++ b/test/fixedbugs/issue34968.go
@@ -0,0 +1,15 @@
+// +build cgo
+// run -gcflags=all=-d=checkptr
+
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// #include <stdlib.h>
+import "C"
+
+func main() {
+	C.malloc(100)
+}