diff --git a/massif-visualizer.spec b/massif-visualizer.spec
index ed7482b..b80f95e 100644
--- a/massif-visualizer.spec
+++ b/massif-visualizer.spec
@@ -23,7 +23,7 @@ Summary:        Visualizer for output generated by Valgrind's massif tool
 License:        LGPL-2.0
 Group:          Development/Tools/Other
 Url:            https://cgit.kde.org/massif-visualizer.git/
-Source:         http://download.kde.org/stable/%{name}/%{version}/src/%{name}-%{version}.tar.xz
+Source:         https://download.kde.org/stable/%{name}/%{version}/src/%{name}-%{version}.tar.xz
 BuildRequires:  extra-cmake-modules
 BuildRequires:  karchive-devel
 BuildRequires:  kconfig-devel