diff --git a/python/plugins/processing/algs/qgis/GridLine.py b/python/plugins/processing/algs/qgis/GridLine.py
index 76ba6a9014a..c3b891a665d 100644
--- a/python/plugins/processing/algs/qgis/GridLine.py
+++ b/python/plugins/processing/algs/qgis/GridLine.py
@@ -124,11 +124,11 @@ class GridLine(QgisAlgorithm):
 
         if width < hSpacing:
             raise QgsProcessingException(
-                self.tr('Horizontal spacing is too small for the covered area'))
+                self.tr('Horizontal spacing is too large for the covered area'))
 
         if height < vSpacing:
             raise QgsProcessingException(
-                self.tr('Vertical spacing is too small for the covered area'))
+                self.tr('Vertical spacing is too large for the covered area'))
 
         fields = QgsFields()
         fields.append(QgsField('left', QVariant.Double, '', 24, 16))
diff --git a/python/plugins/processing/algs/qgis/GridPolygon.py b/python/plugins/processing/algs/qgis/GridPolygon.py
index 23d5de695e3..9ffb78d1485 100644
--- a/python/plugins/processing/algs/qgis/GridPolygon.py
+++ b/python/plugins/processing/algs/qgis/GridPolygon.py
@@ -130,7 +130,7 @@ class GridPolygon(QgisAlgorithm):
 
         if width < hSpacing:
             raise QgsProcessingException(
-                self.tr('Horizontal spacing is too small for the covered area'))
+                self.tr('Horizontal spacing is too large for the covered area'))
 
         if hSpacing <= hOverlay or vSpacing <= vOverlay:
             raise QgsProcessingException(
@@ -138,7 +138,7 @@ class GridPolygon(QgisAlgorithm):
 
         if height < vSpacing:
             raise QgsProcessingException(
-                self.tr('Vertical spacing is too small for the covered area'))
+                self.tr('Vertical spacing is too large for the covered area'))
 
         fields = QgsFields()
         fields.append(QgsField('left', QVariant.Double, '', 24, 16))