diff --git a/renderdoc/driver/gl/gl_driver.cpp b/renderdoc/driver/gl/gl_driver.cpp
index 3ec128583..8a590511e 100644
--- a/renderdoc/driver/gl/gl_driver.cpp
+++ b/renderdoc/driver/gl/gl_driver.cpp
@@ -766,7 +766,7 @@ struct RenderTextState
 		gl.glGetIntegeri_v(eGL_BLEND_DST_RGB, 0, (GLint*)&DestinationRGB);
 		gl.glGetIntegeri_v(eGL_BLEND_DST_ALPHA, 0, (GLint*)&DestinationAlpha);
 		
-		GLenum dummy[2];
+		GLenum dummy[2] = { eGL_FILL, eGL_FILL };
 		// docs suggest this is enumeration[2] even though polygon mode can't be set independently for front
 		// and back faces.
 		gl.glGetIntegerv(eGL_POLYGON_MODE, (GLint *)&dummy);