diff --git a/excavate.gemspec b/excavate.gemspec
index 84157ea..2d6e5d4 100644
--- a/excavate.gemspec
+++ b/excavate.gemspec
@@ -33,6 +33,8 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "arr-pm", "~> 0.0"
   spec.add_runtime_dependency "bundler", "~> 2.3", ">= 2.3.24"
+  # Workaround for https://github.com/metanorma/ruby-libmspack/issues/2
+  spec.add_runtime_dependency "ffi-compiler2", "= 2.0.1"
   spec.add_runtime_dependency "ffi-libarchive-binary", "~> 0.3"
   spec.add_runtime_dependency "libmspack", "~> 0.1"
   spec.add_runtime_dependency "ruby-ole", "~> 1.0"
@@ -40,9 +42,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "seven-zip", "~> 1.4"
   spec.add_runtime_dependency "thor", "~> 1.0"
 
-  # Workaround for https://github.com/metanorma/ruby-libmspack/issues/2
-  spec.add_development_dependency "ffi-compiler2", "= 2.0.1"
-
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "rubocop", "~> 1.7"
   spec.add_development_dependency "rubocop-performance", "~> 1.15"