diff --git a/src/modules/partition/gui/ReplaceWidget.cpp b/src/modules/partition/gui/ReplaceWidget.cpp
index 94f527646..2e5675a11 100644
--- a/src/modules/partition/gui/ReplaceWidget.cpp
+++ b/src/modules/partition/gui/ReplaceWidget.cpp
@@ -212,7 +212,8 @@ ReplaceWidget::onPartitionSelected()
             }
         }
 
-        if ( partition->capacity() < requiredSpaceB )
+        // The loss of precision is ok; we're not going to fall over from a single byte
+        if ( static_cast< double >( partition->capacity() ) < requiredSpaceB )
         {
             updateStatus( CalamaresUtils::Fail,
                           tr( "<strong>%4</strong><br/><br/>"