diff --git a/src/desktop/Window.cpp b/src/desktop/Window.cpp
index 49cce6bc5ee..46225a04c64 100644
--- a/src/desktop/Window.cpp
+++ b/src/desktop/Window.cpp
@@ -1329,8 +1329,8 @@ void CWindow::clampWindowSize(const std::optional<Vector2D> minSize, const std::
     *m_vRealPosition = m_vRealPosition->goal() + DELTA / 2.0;
     *m_vRealSize     = NEWSIZE;
 
-    if (m_bIsFloating && !m_bIsX11 && std::any_of(m_vMatchedRules.begin(), m_vMatchedRules.end(), [](const auto& r) { return r->ruleType == CWindowRule::RULE_PERSISTENT_SIZE; })) {
-        Debug::log(LOG, "clamped window {}::{} to {}x{} (persistent_size)", m_szClass, m_szTitle, m_vRealSize->value().x, m_vRealSize->value().y);
+    if (m_bIsFloating && !m_bIsX11 && std::any_of(m_vMatchedRules.begin(), m_vMatchedRules.end(), [](const auto& r) { return r->ruleType == CWindowRule::RULE_PERSISTENTSIZE; })) {
+        Debug::log(LOG, "clamped window {}::{} to {}x{} (persistentsize)", m_szClass, m_szTitle, m_vRealSize->value().x, m_vRealSize->value().y);
         g_pConfigManager->storeFloatingSize(m_szClass, m_szTitle, m_vRealSize->value());
     }
 }
diff --git a/src/desktop/WindowRule.cpp b/src/desktop/WindowRule.cpp
index 931149c91af..f2d6305d1c4 100644
--- a/src/desktop/WindowRule.cpp
+++ b/src/desktop/WindowRule.cpp
@@ -5,7 +5,7 @@
 #include "../config/ConfigManager.hpp"
 
 static const auto RULES = std::unordered_set<std::string>{
-    "float", "fullscreen", "maximize", "persistent_size", "noinitialfocus", "pin", "stayfocused", "tile", "renderunfocused",
+    "float", "fullscreen", "maximize", "persistentsize", "noinitialfocus", "pin", "stayfocused", "tile", "renderunfocused",
 };
 static const auto RULES_PREFIX = std::unordered_set<std::string>{
     "animation", "bordercolor",   "bordersize", "center",    "content", "fullscreenstate", "group",    "idleinhibit",   "maxsize",     "minsize",
@@ -29,8 +29,8 @@ CWindowRule::CWindowRule(const std::string& rule, const std::string& value, bool
         ruleType = RULE_FULLSCREEN;
     else if (rule == "maximize")
         ruleType = RULE_MAXIMIZE;
-    else if (rule == "persistent_size")
-        ruleType = RULE_PERSISTENT_SIZE;
+    else if (rule == "persistentsize")
+        ruleType = RULE_PERSISTENTSIZE;
     else if (rule == "noinitialfocus")
         ruleType = RULE_NOINITIALFOCUS;
     else if (rule == "pin")