diff --git a/debian/changelog b/debian/changelog
index 705e1dfb..500b0ef3 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 llvm-toolchain-snapshot (1:19~++20240304085905+c7fdd8c11e54-1~exp2) UNRELEASED; urgency=medium
 
   * Make libclang-common-19-dev architecture dependent.
+  * Add python3-pexpect in the build dep for lldb
 
  -- Matthias Klose <doko@debian.org>  Tue, 05 Mar 2024 23:37:18 +0100
 
diff --git a/debian/control b/debian/control
index ed4ae3b4..f2a4cfea 100644
--- a/debian/control
+++ b/debian/control
@@ -16,7 +16,7 @@ Build-Depends: debhelper (>= 10.0), cmake, ninja-build,
     lcov, procps, help2man,
     zlib1g-dev, libzstd-dev,
     g++-multilib [amd64 i386 kfreebsd-amd64 mips64 mips64el mipsel powerpc ppc64 s390 s390x sparc sparc64 x32],
-    libjs-mathjax, python3-myst-parser | python3-recommonmark,
+    libjs-mathjax, python3-myst-parser | python3-recommonmark, python3-pexpect,
     doxygen,
     ocaml-base [amd64 arm64 armhf ppc64el riscv64 s390x] | ocaml-nox [amd64 arm64 armhf ppc64el riscv64 s390x],
     ocaml-findlib [amd64 arm64 armhf ppc64el riscv64 s390x],
diff --git a/debian/control.in b/debian/control.in
index d9df68f9..9b50152e 100644
--- a/debian/control.in
+++ b/debian/control.in
@@ -16,7 +16,7 @@ Build-Depends: debhelper (>= 10.0), cmake, ninja-build,
     lcov, procps, help2man,
     zlib1g-dev, libzstd-dev,
     g++-multilib [amd64 i386 kfreebsd-amd64 mips64 mips64el mipsel powerpc ppc64 s390 s390x sparc sparc64 x32],
-    libjs-mathjax, python3-myst-parser | python3-recommonmark,
+    libjs-mathjax, python3-myst-parser | python3-recommonmark, python3-pexpect,
     doxygen,
     ocaml-base [amd64 arm64 armhf ppc64el riscv64 s390x] | ocaml-nox [amd64 arm64 armhf ppc64el riscv64 s390x],
     ocaml-findlib [amd64 arm64 armhf ppc64el riscv64 s390x],