diff --git a/src/build_settings.cpp b/src/build_settings.cpp
index 1aca5d424..341cbe3e1 100644
--- a/src/build_settings.cpp
+++ b/src/build_settings.cpp
@@ -383,6 +383,7 @@ struct BuildContext {
 
 	u64 vet_flags;
 	u32 sanitizer_flags;
+	StringSet vet_packages;
 
 	bool   has_resource;
 	String link_flags;
@@ -1462,8 +1463,6 @@ gb_internal void init_build_context(TargetMetrics *cross_target, Subtarget subta
 		bc->thread_count = gb_max(bc->affinity.thread_count, 1);
 	}
 
-	string_set_init(&bc->custom_attributes);
-
 	bc->ODIN_VENDOR  = str_lit("odin");
 	bc->ODIN_VERSION = ODIN_VERSION;
 	bc->ODIN_ROOT    = odin_root_dir();
diff --git a/src/checker.cpp b/src/checker.cpp
index 64c66c8a6..deb83bf97 100644
--- a/src/checker.cpp
+++ b/src/checker.cpp
@@ -533,18 +533,13 @@ gb_internal u64 check_vet_flags(CheckerContext *c) {
 	    c->curr_proc_decl->proc_lit) {
 		file = c->curr_proc_decl->proc_lit->file();
 	}
-	if (file && file->vet_flags_set) {
-		return file->vet_flags;
-	}
-	return build_context.vet_flags;
+
+	return ast_file_vet_flags(file);
 }
 
 gb_internal u64 check_vet_flags(Ast *node) {
 	AstFile *file = node->file();
-	if (file && file->vet_flags_set) {
-		return file->vet_flags;
-	}
-	return build_context.vet_flags;
+	return ast_file_vet_flags(file);
 }
 
 enum VettedEntityKind {
@@ -6497,10 +6492,7 @@ gb_internal void check_parsed_files(Checker *c) {
 	TIME_SECTION("check scope usage");
 	for (auto const &entry : c->info.files) {
 		AstFile *f = entry.value;
-		u64 vet_flags = build_context.vet_flags;
-		if (f->vet_flags_set) {
-			vet_flags = f->vet_flags;
-		}
+		u64 vet_flags = ast_file_vet_flags(f);
 		check_scope_usage(c, f->scope, vet_flags);
 	}
 
diff --git a/src/main.cpp b/src/main.cpp
index 06c200442..9b1dcf0fa 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -346,6 +346,7 @@ enum BuildFlagKind {
 	BuildFlag_VetSemicolon,
 	BuildFlag_VetCast,
 	BuildFlag_VetTabs,
+	BuildFlag_VetPackages,
 
 	BuildFlag_CustomAttribute,
 	BuildFlag_IgnoreUnknownAttributes,
@@ -555,6 +556,7 @@ gb_internal bool parse_build_flags(Array<String> args) {
 	add_flag(&build_flags, BuildFlag_VetSemicolon,            str_lit("vet-semicolon"),             BuildFlagParam_None,    Command__does_check);
 	add_flag(&build_flags, BuildFlag_VetCast,                 str_lit("vet-cast"),                  BuildFlagParam_None,    Command__does_check);
 	add_flag(&build_flags, BuildFlag_VetTabs,                 str_lit("vet-tabs"),                  BuildFlagParam_None,    Command__does_check);
+	add_flag(&build_flags, BuildFlag_VetPackages,             str_lit("vet-packages"),              BuildFlagParam_String,  Command__does_check);
 
 	add_flag(&build_flags, BuildFlag_CustomAttribute,         str_lit("custom-attribute"),          BuildFlagParam_String,  Command__does_check, true);
 	add_flag(&build_flags, BuildFlag_IgnoreUnknownAttributes, str_lit("ignore-unknown-attributes"), BuildFlagParam_None,    Command__does_check);
@@ -1221,6 +1223,29 @@ gb_internal bool parse_build_flags(Array<String> args) {
 						case BuildFlag_VetCast:            build_context.vet_flags |= VetFlag_Cast;            break;
 						case BuildFlag_VetTabs:            build_context.vet_flags |= VetFlag_Tabs;            break;
 
+						case BuildFlag_VetPackages:
+							{
+								GB_ASSERT(value.kind == ExactValue_String);
+								String val = value.value_string;
+								String_Iterator it = {val, 0};
+								for (;;) {
+									String pkg = string_split_iterator(&it, ',');
+									if (pkg.len == 0) {
+										break;
+									}
+
+									pkg = string_trim_whitespace(pkg);
+									if (!string_is_valid_identifier(pkg)) {
+										gb_printf_err("-%.*s '%.*s' must be a valid identifier\n", LIT(name), LIT(pkg));
+										bad_flags = true;
+										continue;
+									}
+
+									string_set_add(&build_context.vet_packages, pkg);
+								}
+							}
+							break;
+
 						case BuildFlag_CustomAttribute:
 							{
 								GB_ASSERT(value.kind == ExactValue_String);
@@ -1234,7 +1259,7 @@ gb_internal bool parse_build_flags(Array<String> args) {
 
 									attr = string_trim_whitespace(attr);
 									if (!string_is_valid_identifier(attr)) {
-										gb_printf_err("-custom-attribute '%.*s' must be a valid identifier\n", LIT(attr));
+										gb_printf_err("-%.*s '%.*s' must be a valid identifier\n", LIT(name), LIT(attr));
 										bad_flags = true;
 										continue;
 									}
@@ -3150,6 +3175,9 @@ int main(int arg_count, char const **arg_ptr) {
 
 	build_context.command = command;
 
+	string_set_init(&build_context.custom_attributes);
+	string_set_init(&build_context.vet_packages);
+
 	if (!parse_build_flags(args)) {
 		return 1;
 	}
diff --git a/src/parser.cpp b/src/parser.cpp
index 88147d465..56bea8131 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -1,10 +1,28 @@
 #include "parser_pos.cpp"
 
+gb_internal bool in_vet_packages(AstFile *file) {
+	if (file == nullptr) {
+		return true;
+	}
+	if (file->pkg == nullptr) {
+		return true;
+	}
+	if (build_context.vet_packages.entries.count == 0) {
+		return true;
+	}
+	return string_set_exists(&build_context.vet_packages, file->pkg->name);
+}
+
 gb_internal u64 ast_file_vet_flags(AstFile *f) {
 	if (f != nullptr && f->vet_flags_set) {
 		return f->vet_flags;
 	}
-	return build_context.vet_flags;
+
+	bool found = in_vet_packages(f);
+	if (found) {
+		return build_context.vet_flags;
+	}
+	return 0;
 }
 
 gb_internal bool ast_file_vet_style(AstFile *f) {
@@ -5372,18 +5390,9 @@ gb_internal Ast *parse_stmt(AstFile *f) {
 }
 
 
-
-gb_internal u64 check_vet_flags(AstFile *file) {
-	if (file && file->vet_flags_set) {
-		return file->vet_flags;
-	}
-	return build_context.vet_flags;
-}
-
-
 gb_internal void parse_enforce_tabs(AstFile *f) {
 	// Checks to see if tabs have been used for indentation
-	if ((check_vet_flags(f) & VetFlag_Tabs) == 0) {
+	if ((ast_file_vet_flags(f) & VetFlag_Tabs) == 0) {
 		return;
 	}