diff --git a/intern/opencolorio/ocio_impl_glsl.cc b/intern/opencolorio/ocio_impl_glsl.cc
index e85e5752dda..8d46a2f0773 100644
--- a/intern/opencolorio/ocio_impl_glsl.cc
+++ b/intern/opencolorio/ocio_impl_glsl.cc
@@ -146,7 +146,9 @@ std::list<OCIO_GPUDisplayShader> SHADER_CACHE;
 /** \name Shader
  * \{ */
 
-void string_replace_all(std::string &haystack, const std::string &needle, const std::string &other)
+static void string_replace_all(std::string &haystack,
+                               const std::string &needle,
+                               const std::string &other)
 {
   size_t i = 0, index;
   while ((index = haystack.find(needle, i)) != std::string::npos) {