diff --git a/Controllers/CorsairProController/CorsairProController.cpp b/Controllers/CorsairProController/CorsairProController.cpp
index 7bc10d5d3..386a0d027 100644
--- a/Controllers/CorsairProController/CorsairProController.cpp
+++ b/Controllers/CorsairProController/CorsairProController.cpp
@@ -15,7 +15,7 @@
 #else
 #include <unistd.h>
 
-void Sleep(unsigned int milliseconds)
+static void Sleep(unsigned int milliseconds)
 {
     usleep(1000 * milliseconds);
 }
diff --git a/Controllers/HyperXController/HyperXControllerDetect.cpp b/Controllers/HyperXController/HyperXControllerDetect.cpp
index a3c1339f3..e33450858 100644
--- a/Controllers/HyperXController/HyperXControllerDetect.cpp
+++ b/Controllers/HyperXController/HyperXControllerDetect.cpp
@@ -11,7 +11,7 @@
 #else
 #include <unistd.h>
 
-void Sleep(unsigned int milliseconds)
+static void Sleep(unsigned int milliseconds)
 {
     usleep(1000 * milliseconds);
 }