diff --git a/ant/windows/installer.xml b/ant/windows/installer.xml
index 412c64ce0..e51bf0beb 100644
--- a/ant/windows/installer.xml
+++ b/ant/windows/installer.xml
@@ -16,7 +16,8 @@
             <include name="**/*.dll"/>
             <include name="**/*.exe"/>
         </fileset>
-        <pathconvert pathsep=" " property="win.sign.separated" refid="win.sign.found"/>
+        <!-- Place double quotes between files (sign-win adds surrounding quotes) -->
+        <pathconvert pathsep="&quot; &quot;" property="win.sign.separated" refid="win.sign.found"/>
         <antcall target="sign-win">
             <param name="sign.win.file" value="${win.sign.separated}"/>
         </antcall>
@@ -149,7 +150,7 @@
             <arg value="${signing.keypass}"/>
             <arg value="--tsaurl"/>
             <arg value="${signing.tsaurl}"/>
-            <arg line="${sign.win.file}"/>
+            <arg line="&quot;${sign.win.file}&quot;"/>
         </java>
     </target>
 
@@ -171,7 +172,7 @@
             <arg value="${signing.storepass}"/>
             <arg value="--keypass"/>
             <arg value="${signing.keypass}"/>
-            <arg line="${sign.win.file}"/>
+            <arg line="&quot;${sign.win.file}&quot;"/>
         </java>
     </target>
 </project>