diff --git a/Cargo.toml b/Cargo.toml
index 9cad6ba714e6ae52263a4706a8e8d41c96ffbae4..25e53fe83f46e2708d74222ad8d3185a6b55ab03 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,6 @@ libc = "0.2"
 lru = "0.6.6"
 memmem = "0.1"
 memoffset = "0.6"
-num_cpus = "1"
 # When bumping the version of Sequoia search the code for XXX to find
 # spots where we can take advantage of new features.
 sequoia-openpgp = "1.3"