diff --git a/pypy3.9.spec b/pypy3.9.spec
index e9cb58a..96449a7 100644
--- a/pypy3.9.spec
+++ b/pypy3.9.spec
@@ -327,11 +327,6 @@ rm lib-python/3/idlelib/idle.bat
 rm lib-python/3/distutils/command/*.exe
 
 %build
-%ifarch s390 s390x
-# pypy3 requires z10 at least
-%global optflags %(echo %{optflags} | sed 's/-march=z9-109 /-march=z10 /')
-%endif
-
 # Top memory usage is about 4.5GB on arm7hf
 free