diff --git a/core/testing/runner_windows.odin b/core/testing/runner_windows.odin
index fa233ff84..401804c71 100644
--- a/core/testing/runner_windows.odin
+++ b/core/testing/runner_windows.odin
@@ -1,4 +1,4 @@
-//+private
+#+private
 package testing
 
 import win32 "core:sys/windows"
diff --git a/src/parser.cpp b/src/parser.cpp
index 242671af0..520a23c5a 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -4967,7 +4967,7 @@ gb_internal Ast *parse_import_decl(AstFile *f, ImportDeclKind kind) {
 	}
 
 	if (f->in_when_statement) {
-		syntax_error(import_name, "Cannot use 'import' within a 'when' statement. Prefer using the file suffixes (e.g. foo_windows.odin) or '//+build' tags");
+		syntax_error(import_name, "Cannot use 'import' within a 'when' statement. Prefer using the file suffixes (e.g. foo_windows.odin) or '#+build' tags");
 	}
 
 	if (kind != ImportDecl_Standard) {
diff --git a/tests/core/sys/windows/win32gen/win32gen.cpp b/tests/core/sys/windows/win32gen/win32gen.cpp
index 731173aa6..57a094cd5 100644
--- a/tests/core/sys/windows/win32gen/win32gen.cpp
+++ b/tests/core/sys/windows/win32gen/win32gen.cpp
@@ -902,7 +902,7 @@ static void verify_error_helpers(ofstream& out) {
 }
 
 static void test_core_sys_windows(ofstream& out) {
-	out << "//+build windows" << endl
+	out << "#+build windows" << endl
 		<< "package " << __func__
 		<< " // generated by " << path(__FILE__).filename().replace_extension("").string() << endl
 		<< endl
diff --git a/tests/documentation/documentation_tester.odin b/tests/documentation/documentation_tester.odin
index ce1849e1c..7b125d4e4 100644
--- a/tests/documentation/documentation_tester.odin
+++ b/tests/documentation/documentation_tester.odin
@@ -264,7 +264,7 @@ write_test_suite :: proc(example_tests: []Example_Test) {
 	test_runner := strings.builder_make()
 
 	strings.write_string(&test_runner,
-`//+private
+`#+private
 package documentation_verification
 
 import "core:os"
diff --git a/vendor/box2d/box2d_wasm.odin b/vendor/box2d/box2d_wasm.odin
index eab369a0d..0fcaf753f 100644
--- a/vendor/box2d/box2d_wasm.odin
+++ b/vendor/box2d/box2d_wasm.odin
@@ -1,4 +1,4 @@
-//+build wasm32, wasm64p32
+#+build wasm32, wasm64p32
 package vendor_box2d
 
 @(require) import _ "vendor:libc"
diff --git a/vendor/cgltf/cgltf_wasm.odin b/vendor/cgltf/cgltf_wasm.odin
index f2da86a2c..fb612b2ac 100644
--- a/vendor/cgltf/cgltf_wasm.odin
+++ b/vendor/cgltf/cgltf_wasm.odin
@@ -1,4 +1,4 @@
-//+build wasm32, wasm64p32
+#+build wasm32, wasm64p32
 package cgltf
 
 @(require) import _ "vendor:libc"
diff --git a/vendor/stb/image/stb_image_wasm.odin b/vendor/stb/image/stb_image_wasm.odin
index 77bb44f02..f43012383 100644
--- a/vendor/stb/image/stb_image_wasm.odin
+++ b/vendor/stb/image/stb_image_wasm.odin
@@ -1,4 +1,4 @@
-//+build wasm32, wasm64p32
+#+build wasm32, wasm64p32
 package stb_image
 
 @(require) import _ "vendor:libc"
diff --git a/vendor/stb/rect_pack/stb_rect_pack_wasm.odin b/vendor/stb/rect_pack/stb_rect_pack_wasm.odin
index fb75552ec..c4e2e5160 100644
--- a/vendor/stb/rect_pack/stb_rect_pack_wasm.odin
+++ b/vendor/stb/rect_pack/stb_rect_pack_wasm.odin
@@ -1,4 +1,4 @@
-//+build wasm32, wasm64p32
+#+build wasm32, wasm64p32
 package stb_rect_pack
 
 @(require) import _ "vendor:libc"