diff --git a/tests/pkg_wolfcrypt-ed25519-verify/tests/01-run.py b/tests/pkg_wolfcrypt-ed25519-verify/tests/01-run.py
index e19d2900d6..49d9b5da96 100755
--- a/tests/pkg_wolfcrypt-ed25519-verify/tests/01-run.py
+++ b/tests/pkg_wolfcrypt-ed25519-verify/tests/01-run.py
@@ -4,9 +4,14 @@ import sys
 from testrunner import run
 
 
+# This test needs some time to complete on small platforms. On nrf51dk, it
+# takes >10s.
+TIMEOUT = 20
+
+
 def testfunc(child):
     child.expect_exact("The signature is valid!")
 
 
 if __name__ == "__main__":
-    sys.exit(run(testfunc))
+    sys.exit(run(testfunc, timeout=TIMEOUT))