diff --git a/tests/crypto/test_mbedtls/testcase.ini b/tests/crypto/test_mbedtls/testcase.ini
index f25742db7c2..0a5e31ecbd3 100644
--- a/tests/crypto/test_mbedtls/testcase.ini
+++ b/tests/crypto/test_mbedtls/testcase.ini
@@ -1,12 +1,11 @@
 [test]
 tags = crypto mbedtls
-build_only = false
 kernel = nano
 filter =  ( CONFIG_SRAM_SIZE > 32 or CONFIG_DCCM_SIZE > 32 or
 	    CONFIG_RAM_SIZE > 32 )
 
 [test_nios]
 tags = crypto mbedtls
-build_only = false
 kernel = nano
+slow = true
 arch_whitelist = nios2