diff --git a/src/dpso/backend/windows/windows_selection.cpp b/src/dpso/backend/windows/windows_selection.cpp
index d9db2844..cb3cf61c 100644
--- a/src/dpso/backend/windows/windows_selection.cpp
+++ b/src/dpso/backend/windows/windows_selection.cpp
@@ -361,7 +361,8 @@ LRESULT WindowsSelection::processMessage(
 
 void WindowsSelection::updateBorderWidth()
 {
-    borderWidth = baseBorderWidth * dpi / baseDpi + 0.5f;
+    borderWidth = static_cast<float>(baseBorderWidth)
+        * dpi / baseDpi + 0.5f;
     if (borderWidth < 1)
         borderWidth = 1;
 }
diff --git a/src/dpso/backend/x11/x11_selection.cpp b/src/dpso/backend/x11/x11_selection.cpp
index 1688d885..0fd17572 100644
--- a/src/dpso/backend/x11/x11_selection.cpp
+++ b/src/dpso/backend/x11/x11_selection.cpp
@@ -200,7 +200,8 @@ void X11Selection::handleEvent(const XEvent& event)
 
 void X11Selection::updateBorderWidth()
 {
-    borderWidth = baseBorderWidth * getDpi(display) / baseDpi + 0.5f;
+    borderWidth = static_cast<float>(baseBorderWidth)
+        * getDpi(display) / baseDpi + 0.5f;
     if (borderWidth < 1)
         borderWidth = 1;
 }