diff --git a/pkgs/tools/networking/mosh/bash_completion_datadir.patch b/pkgs/tools/networking/mosh/bash_completion_datadir.patch
new file mode 100644
index 00000000000..4b71f125d28
--- /dev/null
+++ b/pkgs/tools/networking/mosh/bash_completion_datadir.patch
@@ -0,0 +1,19 @@
+diff --git a/configure.ac b/configure.ac
+index 3ad983d..ff8ff96 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -476,13 +476,7 @@ AS_IF([echo "$protobuf_LIBS" | grep -q -- -pthread],
+ 
+ # Bash completion needs to ask where it goes if >= 2.0 is installed.
+ AS_IF([test "$install_completion" != no],
+-  [PKG_CHECK_MODULES([BASH_COMPLETION], [bash-completion >= 2.0],
+-     [if test "$prefix" = "NONE"; then
+-        completions="`pkg-config --variable=completionsdir bash-completion`"
+-      else
+-        completions="`pkg-config --define-variable=prefix=$prefix --variable=completionsdir bash-completion`"
+-      fi],
+-     [completions="${sysconfdir}/bash_completion.d"])
++   [completions="`pkg-config --define-variable=datadir=$datadir --variable=completionsdir bash-completion`"]
+    AC_SUBST([completions])])
+ 
+ AC_CONFIG_FILES([
diff --git a/pkgs/tools/networking/mosh/default.nix b/pkgs/tools/networking/mosh/default.nix
index 648fdb9d20e..26c9035cd79 100644
--- a/pkgs/tools/networking/mosh/default.nix
+++ b/pkgs/tools/networking/mosh/default.nix
@@ -25,6 +25,8 @@ stdenv.mkDerivation rec {
       url = "https://github.com/mobile-shell/mosh/commit/e5f8a826ef9ff5da4cfce3bb8151f9526ec19db0.patch";
       sha256 = "15518rb0r5w1zn4s6981bf1sz6ins6gpn2saizfzhmr13hw4gmhm";
     })
+    # Fix build with bash-completion 2.10
+    ./bash_completion_datadir.patch
   ];
   postPatch = ''
     substituteInPlace scripts/mosh.pl \