diff --git a/util/cmake/pro2cmake.py b/util/cmake/pro2cmake.py
index 0b81cb10e18..767a2b4371c 100755
--- a/util/cmake/pro2cmake.py
+++ b/util/cmake/pro2cmake.py
@@ -153,6 +153,8 @@ def process_qrc_file(target: str, filepath: str, base_dir: str = '', project_fil
         assert(resource.tag == 'qresource')
         lang = resource.get('lang', '')
         prefix = resource.get('prefix', '/')
+        if not prefix.startswith('/'):
+            prefix = '/' + prefix
 
         full_resource_name = resource_name + (str(resource_count) if resource_count > 0 else '')