diff --git a/sagemath.spec b/sagemath.spec
index a6bb44a..4070ffd 100644
--- a/sagemath.spec
+++ b/sagemath.spec
@@ -258,7 +258,7 @@ BuildRequires:	ppl-devel
 BuildRequires:	pynac-devel
 BuildRequires:	python2-devel
 %if %{without bundled_cysignals}
-BuildRequires:	python-cysignals
+BuildRequires:	python-cysignals-devel
 %endif
 BuildRequires:	python-flask-autoindex
 BuildRequires:	python-flask-babel