diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 000d3940..e52316b7 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -416,7 +416,7 @@ uint32_t __gem_create(int fd, int size)
  *
  * Returns: The file-private handle of the created buffer object
  */
-uint32_t gem_create(int fd, int size)
+uint32_t gem_create(int fd, uint64_t size)
 {
 	struct drm_i915_gem_create create;
 
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index ced7ef3a..71875805 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -57,7 +57,7 @@ void gem_set_domain(int fd, uint32_t handle,
 		    uint32_t read_domains, uint32_t write_domain);
 void gem_sync(int fd, uint32_t handle);
 uint32_t __gem_create(int fd, int size);
-uint32_t gem_create(int fd, int size);
+uint32_t gem_create(int fd, uint64_t size);
 void gem_execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf);
 
 void *gem_mmap__gtt(int fd, uint32_t handle, int size, int prot);