diff --git a/.changes/bundler-nsis-deep-links.md b/.changes/bundler-nsis-deep-links.md
new file mode 100644
index 000000000..762a7fd64
--- /dev/null
+++ b/.changes/bundler-nsis-deep-links.md
@@ -0,0 +1,5 @@
+---
+"tauri-bundler": "patch:bug"
+---
+
+Fix NSIS installer deep links registration.
diff --git a/tooling/bundler/src/bundle/windows/templates/installer.nsi b/tooling/bundler/src/bundle/windows/templates/installer.nsi
index 69a46451c..cf804f764 100644
--- a/tooling/bundler/src/bundle/windows/templates/installer.nsi
+++ b/tooling/bundler/src/bundle/windows/templates/installer.nsi
@@ -570,11 +570,11 @@ Section Install
   {{/each}}
 
   ; Register deep links
-  {{#each deep_link_protocol as |protocol| ~}}
-    WriteRegStr SHCTX "Software\Classes\{{protocol}}" "URL Protocol" ""
-    WriteRegStr SHCTX "Software\Classes\{{protocol}}" "" "URL:${BUNDLEID} protocol"
-    WriteRegStr SHCTX "Software\Classes\{{protocol}}\DefaultIcon" "" "$\"$INSTDIR\${MAINBINARYNAME}.exe$\",0"
-    WriteRegStr SHCTX "Software\Classes\{{protocol}}\shell\open\command" "" "$\"$INSTDIR\${MAINBINARYNAME}.exe$\" $\"%1$\""
+  {{#each deep_link_protocols as |protocol| ~}}
+    WriteRegStr SHCTX "Software\Classes\\{{protocol}}" "URL Protocol" ""
+    WriteRegStr SHCTX "Software\Classes\\{{protocol}}" "" "URL:${BUNDLEID} protocol"
+    WriteRegStr SHCTX "Software\Classes\\{{protocol}}\DefaultIcon" "" "$\"$INSTDIR\${MAINBINARYNAME}.exe$\",0"
+    WriteRegStr SHCTX "Software\Classes\\{{protocol}}\shell\open\command" "" "$\"$INSTDIR\${MAINBINARYNAME}.exe$\" $\"%1$\""
   {{/each}}
 
   ; Create uninstaller
@@ -700,10 +700,10 @@ Section Uninstall
   {{/each}}
 
   ; Delete deep links
-  {{#each deep_link_protocol as |protocol| ~}}
-    ReadRegStr $R7 SHCTX "Software\Classes\{{protocol}}\shell\open\command" ""
+  {{#each deep_link_protocols as |protocol| ~}}
+    ReadRegStr $R7 SHCTX "Software\Classes\\{{protocol}}\shell\open\command" ""
     !if $R7 == "$\"$INSTDIR\${MAINBINARYNAME}.exe$\" $\"%1$\""
-      DeleteRegKey SHCTX "Software\Classes\{{protocol}}"
+      DeleteRegKey SHCTX "Software\Classes\\{{protocol}}"
     !endif
   {{/each}}