diff --git a/go/analysis/passes/structtag/structtag.go b/go/analysis/passes/structtag/structtag.go
index 2b67c376..5b27208e 100644
--- a/go/analysis/passes/structtag/structtag.go
+++ b/go/analysis/passes/structtag/structtag.go
@@ -96,6 +96,11 @@ func checkTagDuplicates(pass *analysis.Pass, tag, key string, nearest, field *ty
 	}
 	if val == "" || val[0] == ',' {
 		if field.Anonymous() {
+			// Disable this check enhancement in Go 1.12.1; some
+			// false positives were spotted in the initial 1.12
+			// release. See https://golang.org/issues/30465.
+			return
+
 			typ, ok := field.Type().Underlying().(*types.Struct)
 			if !ok {
 				return
diff --git a/go/analysis/passes/structtag/testdata/src/a/a.go b/go/analysis/passes/structtag/testdata/src/a/a.go
index abb67fe4..0078626d 100644
--- a/go/analysis/passes/structtag/testdata/src/a/a.go
+++ b/go/analysis/passes/structtag/testdata/src/a/a.go
@@ -75,7 +75,7 @@ type DuplicateJSONFields struct {
 	}
 	AnonymousJSON `json:"a"` // want "struct field AnonymousJSON repeats json tag .a. also at a.go:64"
 
-	AnonymousJSONField // want "struct field DuplicateAnonJSON repeats json tag .a. also at a.go:64"
+	AnonymousJSONField
 
 	XML              int `xml:"a"`
 	DuplicateXML     int `xml:"a"` // want "struct field DuplicateXML repeats xml tag .a. also at a.go:80"
@@ -129,5 +129,5 @@ type DuplicateWithAnotherPackage struct {
 
 	// The "also at" position is in a different package and directory. Use
 	// "b.b" instead of "b/b" to match the relative path on Windows easily.
-	DuplicateJSON int `json:"a"` // want "struct field DuplicateJSON repeats json tag .a. also at b.b.go:8"
+	DuplicateJSON int `json:"a"`
 }