diff --git a/engine/shaders/glsl/drawflat_wall.glsl b/engine/shaders/glsl/drawflat_wall.glsl
index 7353e32e1..07e324d6a 100644
--- a/engine/shaders/glsl/drawflat_wall.glsl
+++ b/engine/shaders/glsl/drawflat_wall.glsl
@@ -1,7 +1,7 @@
 !!cvard_srgb_b r_floorcolor
 !!cvard_srgb_b r_wallcolor
 !!permu FOG
-!!samps lm:0
+!!samps lm=0
 
 //this is for the '286' preset walls, and just draws lightmaps coloured based upon surface normals.
 
diff --git a/engine/shaders/glsl/fixedemu.glsl b/engine/shaders/glsl/fixedemu.glsl
index 7dcf2be82..6a92f2fd7 100644
--- a/engine/shaders/glsl/fixedemu.glsl
+++ b/engine/shaders/glsl/fixedemu.glsl
@@ -1,5 +1,5 @@
 !!ver 100-450
-!!samps sourcetex:0
+!!samps sourcetex=0
 
 //this shader is present for support for gles/gl3core contexts
 //it is single-texture-with-vertex-colours, and doesn't do anything special.