diff --git a/bearssl.nim b/bearssl.nim
index d0db82a..1553569 100644
--- a/bearssl.nim
+++ b/bearssl.nim
@@ -8,3 +8,5 @@
 ## those terms.
 import bearssl/[decls, errors]
 export decls, errors
+
+when defined(nimHasUsed): {.used.}
diff --git a/tests/test1.nim b/tests/test1.nim
index b30580e..ed80177 100644
--- a/tests/test1.nim
+++ b/tests/test1.nim
@@ -7,7 +7,5 @@
 import unittest
 import bearssl
 
-when defined(nimHasUsed): {.used.}
-
 test "dummy":
   check true