diff --git a/python/plugins/processing/algs/qgis/ConvexHull.py b/python/plugins/processing/algs/qgis/ConvexHull.py
index e18d2bd823f..0f1a1bc8769 100644
--- a/python/plugins/processing/algs/qgis/ConvexHull.py
+++ b/python/plugins/processing/algs/qgis/ConvexHull.py
@@ -79,8 +79,8 @@ class ConvexHull(GeoAlgorithm):
         if useField:
             index = layer.fieldNameIndex(fieldName)
             fType = layer.pendingFields()[index].type()
-            if fType == QVariant.Int:
-                f.setType(QVariant.Int)
+            if fType in [QVariant.Int, QVariant.UInt, QVariant.LongLong, QVariant.ULongLong]:
+                f.setType(fType)
                 f.setLength(20)
             elif fType == QVariant.Double:
                 f.setType(QVariant.Double)
diff --git a/python/plugins/processing/algs/qgis/ExtractByAttribute.py b/python/plugins/processing/algs/qgis/ExtractByAttribute.py
index 7c3102242ea..d8c33e1d77b 100644
--- a/python/plugins/processing/algs/qgis/ExtractByAttribute.py
+++ b/python/plugins/processing/algs/qgis/ExtractByAttribute.py
@@ -95,7 +95,7 @@ class ExtractByAttribute(GeoAlgorithm):
             raise GeoAlgorithmExecutionException(
                 self.tr('Operators %s can be used only with string fields.' % op))
 
-        if fieldType in [QVariant.Int, QVariant.Double]:
+        if fieldType in [QVariant.Int, QVariant.Double, QVariant.UInt, QVariant.LongLong, QVariant.ULongLong]:
             expr = '"%s" %s %s' % (fieldName, operator, value)
         elif fieldType == QVariant.String:
             if operator not in self.OPERATORS[-2:]:
diff --git a/python/plugins/processing/algs/qgis/Merge.py b/python/plugins/processing/algs/qgis/Merge.py
index 0dd116fcf62..b348a57b964 100644
--- a/python/plugins/processing/algs/qgis/Merge.py
+++ b/python/plugins/processing/algs/qgis/Merge.py
@@ -97,7 +97,7 @@ class Merge(GeoAlgorithm):
                 sattributes = feature.attributes()
                 dattributes = []
                 for dindex, dfield in enumerate(fields):
-                    if (dfield.type() == QVariant.Int):
+                    if (dfield.type() == QVariant.Int, QVariant.UInt, QVariant.LongLong, QVariant.ULongLong):
                         dattribute = 0
                     elif (dfield.type() == QVariant.Double):
                         dattribute = 0.0
diff --git a/python/plugins/processing/algs/qgis/SelectByAttribute.py b/python/plugins/processing/algs/qgis/SelectByAttribute.py
index 38f9a4829f3..208d436f7e0 100644
--- a/python/plugins/processing/algs/qgis/SelectByAttribute.py
+++ b/python/plugins/processing/algs/qgis/SelectByAttribute.py
@@ -94,7 +94,7 @@ class SelectByAttribute(GeoAlgorithm):
             raise GeoAlgorithmExecutionException(
                 self.tr('Operators %s can be used only with string fields.' % op))
 
-        if fieldType in [QVariant.Int, QVariant.Double]:
+        if fieldType in [QVariant.Int, QVariant.Double, QVariant.UInt, QVariant.LongLong, QVariant.ULongLong]:
             expr = '"%s" %s %s' % (fieldName, operator, value)
         elif fieldType == QVariant.String:
             if operator not in self.OPERATORS[-2:]: