diff --git a/context/logger.go b/context/logger.go
index 78e4212a..8c4c6f6c 100644
--- a/context/logger.go
+++ b/context/logger.go
@@ -54,8 +54,14 @@ func GetLoggerWithField(ctx Context, key, value interface{}, keys ...interface{}
 // GetLoggerWithFields returns a logger instance with the specified fields
 // without affecting the context. Extra specified keys will be resolved from
 // the context.
-func GetLoggerWithFields(ctx Context, fields map[string]interface{}, keys ...interface{}) Logger {
-	return getLogrusLogger(ctx, keys...).WithFields(logrus.Fields(fields))
+func GetLoggerWithFields(ctx Context, fields map[interface{}]interface{}, keys ...interface{}) Logger {
+	// must convert from interface{} -> interface{} to string -> interface{} for logrus.
+	lfields := make(logrus.Fields, len(fields))
+	for key, value := range fields {
+		lfields[fmt.Sprint(key)] = value
+	}
+
+	return getLogrusLogger(ctx, keys...).WithFields(lfields)
 }
 
 // GetLogger returns the logger from the current context, if present. If one
@@ -89,7 +95,6 @@ func getLogrusLogger(ctx Context, keys ...interface{}) *logrus.Entry {
 	}
 
 	fields := logrus.Fields{}
-
 	for _, key := range keys {
 		v := ctx.Value(key)
 		if v != nil {
diff --git a/context/util.go b/context/util.go
index c0aff00d..299edc00 100644
--- a/context/util.go
+++ b/context/util.go
@@ -20,7 +20,7 @@ func Since(ctx Context, key interface{}) time.Duration {
 
 // GetStringValue returns a string value from the context. The empty string
 // will be returned if not found.
-func GetStringValue(ctx Context, key string) (value string) {
+func GetStringValue(ctx Context, key interface{}) (value string) {
 	stringi := ctx.Value(key)
 	if stringi != nil {
 		if valuev, ok := stringi.(string); ok {
diff --git a/registry/storage/blobwriter.go b/registry/storage/blobwriter.go
index e0e7239c..b384fa8a 100644
--- a/registry/storage/blobwriter.go
+++ b/registry/storage/blobwriter.go
@@ -241,7 +241,7 @@ func (bw *blobWriter) validateBlob(ctx context.Context, desc distribution.Descri
 
 	if !verified {
 		context.GetLoggerWithFields(ctx,
-			map[string]interface{}{
+			map[interface{}]interface{}{
 				"canonical": canonical,
 				"provided":  desc.Digest,
 			}, "canonical", "provided").