diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index a4007aadb7c67..18cc8d84e57d8 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -594,7 +594,7 @@ def apply_redirected_remote!(redirected_remote, quiet: false)
   def git_command!(args, chdir: nil)
     require "system_command"
 
-    SystemCommand.run!("git", args:, chdir:, print_stderr: true)
+    SystemCommand.run!("git", args:, chdir:, env: { "GIT_TERMINAL_PROMPT" => "0" }, print_stderr: true)
   end
   private :git_command!
 
diff --git a/Library/Homebrew/test/tap_spec.rb b/Library/Homebrew/test/tap_spec.rb
index b07b1e08d49c9..5d7e28a751ba4 100644
--- a/Library/Homebrew/test/tap_spec.rb
+++ b/Library/Homebrew/test/tap_spec.rb
@@ -619,6 +619,15 @@ def setup_completion(link:)
   end
 
   describe "#install" do
+    it "disables terminal prompts for git commands" do
+      require "system_command"
+
+      expect(SystemCommand).to receive(:run!)
+        .with("git", args: %w[fetch], chdir: path, env: { "GIT_TERMINAL_PROMPT" => "0" }, print_stderr: true)
+
+      homebrew_foo_tap.send(:git_command!, %w[fetch], chdir: path)
+    end
+
     it "raises an error when the Tap is already tapped" do
       setup_git_repo
       already_tapped_tap = described_class.fetch("Homebrew", "foo")