Avoid ambiguous overload.

1 files changed, 1 insertions, 1 deletions

diff --git a/document/src/vespa/document/fieldvalue/numericfieldvalue.h b/document/src/vespa/document/fieldvalue/numericfieldvalue.h
index 0a557af93d9..28981fc5286 100644
--- a/document/src/vespa/document/fieldvalue/numericfieldvalue.h
+++ b/document/src/vespa/document/fieldvalue/numericfieldvalue.h
@@ -31,7 +31,7 @@ protected:
 public:
     typedef Number value_type;
 
-    NumericFieldValue(Number value=0) : NumericFieldValueBase(), _value(value), _altered(false) { }
+    explicit NumericFieldValue(Number value=0) : NumericFieldValueBase(), _value(value), _altered(false) { }
 
     value_type getValue() const { return _value; }
     void setValue(Number newValue) { _value = newValue; }