diff --git a/libretro-common/glsm/glsm.c b/libretro-common/glsm/glsm.c
index 3e63aa26c8..7e96ca8a5f 100644
--- a/libretro-common/glsm/glsm.c
+++ b/libretro-common/glsm/glsm.c
@@ -1878,9 +1878,10 @@ void rglFlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length
  * OpenGL    : 3.2
  * OpenGLES  : 3.0
  */
-GLenum rglClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout) {
+GLenum rglClientWaitSync(void *sync, GLbitfield flags, uint64_t timeout)
+{
 #if defined(HAVE_OPENGL) || defined(HAVE_OPENGLES) && defined(HAVE_OPENGLES3)
-  return glClientWaitSync(sync, flags, timeout);
+  return glClientWaitSync((GLsync)sync, flags, (GLuint64)timeout);
 #endif
 }
 
diff --git a/libretro-common/include/glsm/glsmsym.h b/libretro-common/include/glsm/glsmsym.h
index 9a1f16810a..2ef21bed99 100644
--- a/libretro-common/include/glsm/glsmsym.h
+++ b/libretro-common/include/glsm/glsmsym.h
@@ -403,7 +403,7 @@ void *rglFenceSync(GLenum condition, GLbitfield flags);
 void rglWaitSync(void *sync, GLbitfield flags, uint64_t timeout);
 void rglBufferStorage(GLenum target, GLsizeiptr size, const GLvoid *data, GLbitfield flags);
 void rglFlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length);
-GLenum rglClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout);
+GLenum rglClientWaitSync(void *sync, GLbitfield flags, uint64_t timeout);
 void rglDrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type,
 			       GLvoid *indices, GLint basevertex);