diff --git a/renderdoc/driver/gl/gl_debug.cpp b/renderdoc/driver/gl/gl_debug.cpp
index c1e28309a..ae01c97fc 100644
--- a/renderdoc/driver/gl/gl_debug.cpp
+++ b/renderdoc/driver/gl/gl_debug.cpp
@@ -425,10 +425,17 @@ void GLReplay::InitDebugData()
           "#extension GL_ARB_shader_bit_encoding : require\n";
   }
 
-  vs = GenerateGLSLShader(GetEmbeddedResource(glsl_blit_vert), shaderType, glslBaseVer,
-                          "#extension GL_ARB_separate_shader_objects : require\n"
-                          "#extension GL_ARB_explicit_attrib_location : require\n"
-                          "#define FORCE_IO_LOCATION 1");
+  rdcstr vsDefines = "#define FORCE_IO_LOCATION 1";
+
+  if(!IsGLES)
+  {
+    vsDefines =
+        "#extension GL_ARB_separate_shader_objects : require\n"
+        "#extension GL_ARB_explicit_attrib_location : require\n" +
+        vsDefines;
+  }
+
+  vs = GenerateGLSLShader(GetEmbeddedResource(glsl_blit_vert), shaderType, glslBaseVer, vsDefines);
 
   // used to combine with custom shaders.
   // this has to have explicit locations on the output even though we don't normally use that,