diff --git a/src/config/ConfigManager.cpp b/src/config/ConfigManager.cpp
index 92e7f0cf..34cb896f 100644
--- a/src/config/ConfigManager.cpp
+++ b/src/config/ConfigManager.cpp
@@ -42,6 +42,7 @@ void CConfigManager::setDefaultVars() {
     configValues["decoration:blur_passes"].intValue = 1;
     configValues["decoration:active_opacity"].floatValue = 1;
     configValues["decoration:inactive_opacity"].floatValue = 1;
+    configValues["decoration:fullscreen_opacity"].floatValue = 1;
 
     configValues["dwindle:pseudotile"].intValue = 0;
     configValues["dwindle:col.group_border"].intValue = 0x66777700;
@@ -849,4 +850,4 @@ void CConfigManager::performMonitorReload() {
 
 SConfigValue* CConfigManager::getConfigValuePtr(std::string val) {
     return &configValues[val];
-}
\ No newline at end of file
+}
diff --git a/src/render/Renderer.cpp b/src/render/Renderer.cpp
index 0d646317..fef08429 100644
--- a/src/render/Renderer.cpp
+++ b/src/render/Renderer.cpp
@@ -97,7 +97,8 @@ void CHyprRenderer::renderWindow(CWindow* pWindow, SMonitor* pMonitor, timespec*
     renderdata.h = pWindow->m_vRealSize.vec().y;
     renderdata.dontRound = pWindow->m_bIsFullscreen;
     renderdata.fadeAlpha = pWindow->m_fAlpha.fl() * (PWORKSPACE->m_fAlpha.fl() / 255.f);
-    renderdata.alpha = pWindow == g_pCompositor->m_pLastWindow ? g_pConfigManager->getFloat("decoration:active_opacity") : g_pConfigManager->getFloat("decoration:inactive_opacity");
+    renderdata.alpha = pWindow->m_bIsFullscreen ? g_pConfigManager->getFloat("decoration:fullscreen_opacity") :
+        pWindow == g_pCompositor->m_pLastWindow ? g_pConfigManager->getFloat("decoration:active_opacity") : g_pConfigManager->getFloat("decoration:inactive_opacity");
 
     // apply window special data
     renderdata.alpha *= pWindow->m_sSpecialRenderData.alpha;