diff --git a/src/cmd/compile/internal/ssagen/abi.go b/src/cmd/compile/internal/ssagen/abi.go
index 3a767d6d1c..84d5b5951c 100644
--- a/src/cmd/compile/internal/ssagen/abi.go
+++ b/src/cmd/compile/internal/ssagen/abi.go
@@ -204,7 +204,7 @@ func (s *SymABIs) GenABIWrappers() {
 		// Double check that cgo-exported symbols don't get
 		// any wrappers.
 		if len(cgoExport) > 0 && fn.ABIRefs&^obj.ABISetOf(fn.ABI) != 0 {
-			base.Fatalf("cgo exported function %s cannot have ABI wrappers", fn)
+			base.Fatalf("cgo exported function %v cannot have ABI wrappers", fn)
 		}
 
 		if !buildcfg.Experiment.RegabiWrappers {