diff --git a/dot_gitconfig.tmpl b/dot_gitconfig.tmpl
index 31c5313..8c36c41 100644
--- a/dot_gitconfig.tmpl
+++ b/dot_gitconfig.tmpl
@@ -81,14 +81,18 @@
 {{-   end }}
 {{-   if .signingkey }}
 	signingKey = {{ .signingkey }}
+{{-   else }}
+	signingKey = ~/.ssh/id_ed25519.pub
 {{-   end }}
 [tag]
 	forceSignAnnotated = true
 [commit]
 	gpgSign = true
 [gpg]
-{{-   if eq .chezmoi.os "windows" }}
+{{-   if .signingkey }}
+{{-     if eq .chezmoi.os "windows" }}
  	program = "C:\\Program Files (x86)\\gnupg\\bin\\gpg.exe"
+{{-     end }}
 {{-   else }}
 	format = ssh
 {{-   end }}