diff --git a/gnu/packages/gdb.scm b/gnu/packages/gdb.scm
index 7a780d8ea2..f521ef5839 100644
--- a/gnu/packages/gdb.scm
+++ b/gnu/packages/gdb.scm
@@ -43,7 +43,8 @@
                "08vcb97j1b7vxwq6088wb6s3g3bm8iwikd922y0xsgbbxv3d2104"))))
     (build-system gnu-build-system)
     (arguments
-     '(#:phases (alist-cons-after
+     '(#:tests? #f ; FIXME "make check" fails on single-processor systems.
+       #:phases (alist-cons-after
                  'configure 'post-configure
                  (lambda _
                    (for-each patch-makefile-SHELL