diff --git a/src/BoxLayout.cpp b/src/BoxLayout.cpp
index 0d9cd20..0c0412c 100644
--- a/src/BoxLayout.cpp
+++ b/src/BoxLayout.cpp
@@ -57,7 +57,13 @@ void BoxLayout::run() {
         }
     }
 
-    double space_per_unslotted_widget = free_space / unslotted_widgets - m_spacing;
+    double spacing_targets = (unslotted_widgets - 1);
+    if (spacing_targets < 0)
+        spacing_targets = 0;
+
+    free_space -= spacing_targets * m_spacing;
+
+    double space_per_unslotted_widget = free_space / unslotted_widgets;
 
     for (unsigned int i = 0; i < m_target->children().size(); i++) {
         auto child = m_target->children()[i];