diff --git a/guix/build/cmake-build-system.scm b/guix/build/cmake-build-system.scm
index 74b4f01..b1598dd 100644
--- a/guix/build/cmake-build-system.scm
+++ b/guix/build/cmake-build-system.scm
@@ -53,6 +53,8 @@
                                              build-type))
                         '())
                   ,(string-append "-DCMAKE_INSTALL_PREFIX=" out)
+                  ;; Install libraries to $prefix/lib, not $prefix/lib64.
+                  "-DCMAKE_INSTALL_LIBDIR=lib"
                   ;; add input libraries to rpath
                   "-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=TRUE"
                   ;; add (other) libraries of the project itself to rpath