diff --git a/Sources/Plasma/Apps/plClient/CMakeLists.txt b/Sources/Plasma/Apps/plClient/CMakeLists.txt
index bd42ba35e5..d9ae3b20b8 100644
--- a/Sources/Plasma/Apps/plClient/CMakeLists.txt
+++ b/Sources/Plasma/Apps/plClient/CMakeLists.txt
@@ -246,6 +246,7 @@ target_link_libraries(
         CURL::libcurl
         "$<$<PLATFORM_ID:Darwin>:-framework Cocoa>"
         "$<$<PLATFORM_ID:Darwin>:-framework QuartzCore>"
+        "$<$<PLATFORM_ID:Darwin>:-framework IOKit>"
 )
 target_include_directories(plClient PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
 
diff --git a/Sources/Plasma/Apps/plClient/Mac-Cocoa/main.mm b/Sources/Plasma/Apps/plClient/Mac-Cocoa/main.mm
index 0059ef3ebd..3875ee87ac 100644
--- a/Sources/Plasma/Apps/plClient/Mac-Cocoa/main.mm
+++ b/Sources/Plasma/Apps/plClient/Mac-Cocoa/main.mm
@@ -49,6 +49,7 @@
 #import <Metal/Metal.h>
 #endif
 #import <QuartzCore/QuartzCore.h>
+#import <IOKit/pwr_mgt/IOPMLib.h>
 
 // Cocoa client
 #import "NSString+StringTheory.h"
@@ -64,6 +65,7 @@
 #include <unordered_set>
 
 // Plasma engine
+#include "hsDarwin.h"
 #include "plClient/plClient.h"
 #include "plClient/plClientLoader.h"
 #include "plCmdParser.h"
@@ -478,6 +480,16 @@ - (void)startClient
     ((PLSView*)self.window.contentView).inputManager = gClient->GetInputManager();
     [self.window makeFirstResponder:self.window.contentView];
 
+    IOPMAssertionID assertionID = 0;
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
+    IOReturn result = IOPMAssertionCreateWithName(kIOPMAssertionTypePreventUserIdleDisplaySleep, kIOPMAssertionLevelOn, CFStringCreateWithSTString(plProduct::LongName()), &assertionID);
+#else
+    IOReturn result = IOPMAssertionCreate(kIOPMAssertionTypeNoDisplaySleep, kIOPMAssertionLevelOn, &assertionID);
+#endif
+    if (result != kIOReturnSuccess) {
+        hsStatusMessage("Failed to acquire idle prevention assertion");
+    }
+
     // Main loop
     if (gClient && !gClient->GetDone()) {
         [self startRunLoop];