diff --git a/python/analysis/interpolation/qgsinterpolator.sip b/python/analysis/interpolation/qgsinterpolator.sip
index adba56507be..8e0dd1ff22e 100644
--- a/python/analysis/interpolation/qgsinterpolator.sip
+++ b/python/analysis/interpolation/qgsinterpolator.sip
@@ -79,7 +79,7 @@ class QgsInterpolator
 %Docstring
 Feature source
 %End
-      ValueSource valueSource;
+      QgsInterpolator::ValueSource valueSource;
 %Docstring
 Source for feature values to interpolate
 %End
diff --git a/src/analysis/interpolation/qgsinterpolator.h b/src/analysis/interpolation/qgsinterpolator.h
index 2340c257aa0..1a3a6dd6757 100644
--- a/src/analysis/interpolation/qgsinterpolator.h
+++ b/src/analysis/interpolation/qgsinterpolator.h
@@ -95,7 +95,7 @@ class ANALYSIS_EXPORT QgsInterpolator
       //! Feature source
       QgsFeatureSource *source = nullptr;
       //! Source for feature values to interpolate
-      ValueSource valueSource = ValueAttribute;
+      QgsInterpolator::ValueSource valueSource = QgsInterpolator::ValueAttribute;
       //! Index of feature attribute to use for interpolation
       int interpolationAttribute = -1;
       //! Source type