diff --git a/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.cpp b/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.cpp
index 46bdd6b6fa..43f9ec7782 100644
--- a/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.cpp
+++ b/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.cpp
@@ -103,6 +103,7 @@ static const char * TryLoadAllProcAddresses()
     SetupOpenGLFunction(glLinkProgram);
     SetupOpenGLFunction(glShaderSource);
     SetupOpenGLFunction(glUniform1i);
+    SetupOpenGLFunction(glUniform1iv);
     SetupOpenGLFunction(glUniform2i);
     SetupOpenGLFunction(glUniform2f);
     SetupOpenGLFunction(glUniform4f);
diff --git a/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.h b/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.h
index 71360784c6..35105981a3 100644
--- a/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.h
+++ b/src/openrct2-ui/drawing/engines/opengl/OpenGLAPI.h
@@ -165,6 +165,7 @@ GLAPI_DECL PFNGLGENVERTEXARRAYSPROC             glGenVertexArrays           GLAP
 GLAPI_DECL PFNGLLINKPROGRAMPROC                 glLinkProgram               GLAPI_SET;
 GLAPI_DECL PFNGLSHADERSOURCEPROC                glShaderSource              GLAPI_SET;
 GLAPI_DECL PFNGLUNIFORM1IPROC                   glUniform1i                 GLAPI_SET;
+GLAPI_DECL PFNGLUNIFORM1IVPROC                  glUniform1iv                GLAPI_SET;
 GLAPI_DECL PFNGLUNIFORM2IPROC                   glUniform2i                 GLAPI_SET;
 GLAPI_DECL PFNGLUNIFORM2FPROC                   glUniform2f                 GLAPI_SET;
 GLAPI_DECL PFNGLUNIFORM4FPROC                   glUniform4f                 GLAPI_SET;