diff --git a/misc/glslc-test-basic.frag.glsl b/misc/glslc-test-basic.frag.glsl
index 3bec68c73d..405e1f965b 100644
--- a/misc/glslc-test-basic.frag.glsl
+++ b/misc/glslc-test-basic.frag.glsl
@@ -8,5 +8,8 @@ layout(location = 0) uniform sampler2D tex;
 layout(location = 1) uniform vec4 color;
 
 void main(void) {
-    outColor = texture(tex, texCoord) * color;
+	// https://github.com/KhronosGroup/glslang/issues/2206
+    float foo = 42;
+    foo = smoothstep(0, 1, foo);
+    outColor = texture(tex, texCoord) * color * foo;
 }
diff --git a/resources/00-taisei.pkgdir/shader/meson.build b/resources/00-taisei.pkgdir/shader/meson.build
index b4ad2c033b..145608a773 100644
--- a/resources/00-taisei.pkgdir/shader/meson.build
+++ b/resources/00-taisei.pkgdir/shader/meson.build
@@ -170,30 +170,29 @@ if validate_glsl != 'false'
 
         if test_result.returncode() == 0
             glslc_args += '-Werror'
-            validate_glsl = true
         else
             glslc_args += '-std=430core'
             warning('glslc does not support GL_ARB_explicit_uniform_location, forcing shader version to 430core as a workaround.\n\n@0@'.format(test_result.stderr()))
+        endif
 
-            test_result = run_command(glslc_command,
-                glslc_args,
-                glslc_frag_args,
-                glslc_test_basic_file,
-                '-o', '-',
-                capture : false
-            )
+        test_result = run_command(glslc_command,
+            glslc_args,
+            glslc_frag_args,
+            glslc_test_basic_file,
+            '-o', '-',
+            capture : false
+        )
 
-            if test_result.returncode() == 0
-                validate_glsl = true
-            else
-                warning(test_result.stderr())
+        if test_result.returncode() == 0
+            validate_glsl = true
+        else
+            warning(test_result.stderr())
 
-                if validate_glsl == 'auto'
-                    warning('glslc test failed, you probably have an incompatible version. GLSL validation will be disabled.')
-                    validate_glsl = false
-                else
-                    error('glslc test failed, you probably have an incompatible version.')
-                endif
+            if validate_glsl == 'auto'
+                warning('Basic glslc test failed, you probably have a broken/incompatible version. GLSL validation will be disabled.')
+                validate_glsl = false
+            else
+                error('Basic glslc test failed, you probably have a broken/incompatible version.')
             endif
         endif
     else