diff --git a/libs/vkd3d-shader/preproc.l b/libs/vkd3d-shader/preproc.l
index 4a8d0fdda..4e39bf659 100644
--- a/libs/vkd3d-shader/preproc.l
+++ b/libs/vkd3d-shader/preproc.l
@@ -71,8 +71,8 @@ INT_SUFFIX      [uUlL]{0,2}
 
 %%
 
-<INITIAL>"//"                       {yy_push_state(CXX_COMMENT, yyscanner);}
-<INITIAL>"/*"                       {yy_push_state(C_COMMENT, yyscanner);}
+<INITIAL,INCLUDE,LINE>"//"          {yy_push_state(CXX_COMMENT, yyscanner);}
+<INITIAL,INCLUDE,LINE>"/*"          {yy_push_state(C_COMMENT, yyscanner);}
 <CXX_COMMENT>\\{NEWLINE}            {}
 <CXX_COMMENT>\n                     {
         yy_pop_state(yyscanner);
diff --git a/tests/hlsl_d3d12.c b/tests/hlsl_d3d12.c
index 268856b03..6d3569cf4 100644
--- a/tests/hlsl_d3d12.c
+++ b/tests/hlsl_d3d12.c
@@ -59,7 +59,7 @@ static void check_preprocess_(const char *file, int line, const char *source,
 
 static const char test_include_top[] =
     "#include \"file1\"\n"
-    "#include < file2 >\n"
+    "#include/* a comment */< file2 >//another comment\n"
     "ARGES\n";
 
 static const char test_include_file1[] =