diff --git a/curl.spec b/curl.spec
index 9a107c1..0fe142a 100644
--- a/curl.spec
+++ b/curl.spec
@@ -212,6 +212,11 @@ printf "582\n1452\n" >> tests/data/DISABLED
 printf "702\n703\n716\n" >> tests/data/DISABLED
 %endif
 
+# temporarily disable tests 300{0,1} on x86_64 (stunnel clashes with itself)
+%ifarch x86_64
+printf "3000\n3001\n" >> tests/data/DISABLED
+%endif
+
 # adapt test 323 for updated OpenSSL
 sed -e 's|^35$|35,52|' -i tests/data/test323