diff --git a/plugin/src/Caelestia/Config/font.cpp b/plugin/src/Caelestia/Config/font.cpp
index 852e8355..142fd394 100644
--- a/plugin/src/Caelestia/Config/font.cpp
+++ b/plugin/src/Caelestia/Config/font.cpp
@@ -20,7 +20,7 @@ QFont FontStyleBase::small() const {
 QFont FontStyleBase::buildFont(const FontConfig* cfg, const QString& fallbackFamily) {
     QFont font;
     font.setFamily(cfg->family().isEmpty() ? fallbackFamily : cfg->family());
-    font.setPointSize(cfg->size());
+    font.setPointSize(cfg->size() > 0 ? cfg->size() : 1);
     font.setWeight(QFont::Weight(cfg->weight()));
     font.setItalic(cfg->italic());
 
diff --git a/plugin/src/Caelestia/Config/fontbuilder.cpp b/plugin/src/Caelestia/Config/fontbuilder.cpp
index 9750e695..dba3604a 100644
--- a/plugin/src/Caelestia/Config/fontbuilder.cpp
+++ b/plugin/src/Caelestia/Config/fontbuilder.cpp
@@ -11,6 +11,8 @@ FontBuilder FontBuilder::family(const QString& family) {
 }
 
 FontBuilder FontBuilder::size(int pointSize) {
+    if (pointSize <= 0)
+        pointSize = 1;
     m_font.setPointSize(pointSize);
     m_font.setVariableAxis("opsz", static_cast<float>(pointSize));
     return *this;