diff --git a/src/native/linux/opengl/org_lwjgl_opengl_Display.c b/src/native/linux/opengl/org_lwjgl_opengl_Display.c
index c1e2290b..d2629edd 100644
--- a/src/native/linux/opengl/org_lwjgl_opengl_Display.c
+++ b/src/native/linux/opengl/org_lwjgl_opengl_Display.c
@@ -178,7 +178,7 @@ static void setWindowTitle(Display *disp, Window window, jlong title, jint len)
 	XChangeProperty(disp, window,
 					XInternAtom(disp, "_NET_WM_NAME", False),
 					XInternAtom(disp, "UTF8_STRING", False),
-					8, PropModeReplace, (const char *)(intptr_t)title,
+					8, PropModeReplace, (const unsigned char *)(intptr_t)title,
 					len);
 }
 
diff --git a/src/native/linux/opengles/org_lwjgl_opengl_Display.c b/src/native/linux/opengles/org_lwjgl_opengl_Display.c
index c379c8dc..19ac3809 100644
--- a/src/native/linux/opengles/org_lwjgl_opengl_Display.c
+++ b/src/native/linux/opengles/org_lwjgl_opengl_Display.c
@@ -175,7 +175,7 @@ static void setWindowTitle(Display *disp, Window window, jlong title, jint len)
 	XChangeProperty(disp, window,
 					XInternAtom(disp, "_NET_WM_NAME", False),
 					XInternAtom(disp, "UTF8_STRING", False),
-					8, PropModeReplace, (const char *)(intptr_t)title,
+					8, PropModeReplace, (const unsigned char *)(intptr_t)title,
 					len);
 }