diff --git a/src/libcalamaresui/utils/CalamaresUtilsGui.cpp b/src/libcalamaresui/utils/CalamaresUtilsGui.cpp
index 3c59b0f89..e4dc6b555 100644
--- a/src/libcalamaresui/utils/CalamaresUtilsGui.cpp
+++ b/src/libcalamaresui/utils/CalamaresUtilsGui.cpp
@@ -239,6 +239,7 @@ void
 setDefaultFontSize( int points )
 {
     s_defaultFontSize = points;
+    s_defaultFontHeight = 0;  // Recalculate on next call to defaultFontHeight()
 }