diff --git a/libctru/include/3ds/services/gsplcd.h b/libctru/include/3ds/services/gsplcd.h
index 3f218a9..15f3fce 100644
--- a/libctru/include/3ds/services/gsplcd.h
+++ b/libctru/include/3ds/services/gsplcd.h
@@ -39,6 +39,7 @@ Result GSPLCD_GetVendors(u8 *vendors);
 
 /**
  * @brief Gets the LCD screens' brightness. Stubbed on old 3ds.
- * @param screen to get the brightness value.
+ * @param screen Screen to get the brightness value of.
+ * @param brightness Brightness value returned.
  */
-Result GSPLCD_GetBrightness(u32 *screen);
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+Result GSPLCD_GetBrightness(u32 screen, u32 *brightness);
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diff --git a/libctru/source/services/gsplcd.c b/libctru/source/services/gsplcd.c
index 70b919d..f9dcd67 100644
--- a/libctru/source/services/gsplcd.c
+++ b/libctru/source/services/gsplcd.c
@@ -66,17 +66,17 @@ Result GSPLCD_GetVendors(u8 *vendors)
 	return cmdbuf[1];
 }
 
-Result GSPLCD_GetBrightness(u32 *screen)
+Result GSPLCD_GetBrightness(u32 screen, u32 *brightness)
 {
     u32 *cmdbuf = getThreadCommandBuffer();
  
     cmdbuf[0] = IPC_MakeHeader(0x15,1,0); // 0x150040
-    cmdbuf[1] = *screen;
+    cmdbuf[1] = screen;
  
     Result ret = 0;
     if (R_FAILED(ret = svcSendSyncRequest(gspLcdHandle))) return ret;
    
-    *screen = cmdbuf[2];
+    *brightness = cmdbuf[2];
    
-    return cmdbuf[1];
+    return cmdbuf[2];
 }
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