diff --git a/vlib/v/fmt/tests/import_duplicate_input.vv b/vlib/v/fmt/tests/import_duplicate_input.vv
deleted file mode 100644
index 2d248cb482..0000000000
--- a/vlib/v/fmt/tests/import_duplicate_input.vv
+++ /dev/null
@@ -1,18 +0,0 @@
-import math
-import os
-import math
-// keep comment
-import gg
-import gg { MouseButton }
-import time { Duration }
-import time { Duration }
-import math.complex { Complex }
-import math.complex { Complex }
-
-const mypi = math.pi
-const mb = MouseButton{}
-const complex = Complex{}
-
-fn main() {
-	println(os.path_separator)
-}
diff --git a/vlib/v/parser/module.v b/vlib/v/parser/module.v
index 69df3d099f..472b7e7c2e 100644
--- a/vlib/v/parser/module.v
+++ b/vlib/v/parser/module.v
@@ -310,6 +310,11 @@ fn (mut p Parser) import_syms(mut parent ast.Import) {
 	for p.tok.kind == .name {
 		pos := p.tok.pos()
 		alias := p.check_name()
+		if alias in p.imported_symbols {
+			p.error_with_pos('cannot register symbol `${alias}`, it was already imported',
+				pos)
+			return
+		}
 		p.imported_symbols[alias] = parent.mod + '.' + alias
 		// so we can work with this in fmt+checker
 		parent.syms << ast.ImportSymbol{