diff --git a/CMakeLists.txt b/CMakeLists.txt
index db99075b75..b834df8653 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2333,6 +2333,7 @@ if(NOT CURL_DISABLE_INSTALL)
   endforeach()
 
   if(LIBCURL_PC_REQUIRES_PRIVATE)
+    list(REMOVE_DUPLICATES LIBCURL_PC_REQUIRES_PRIVATE)
     string(REPLACE ";" "," LIBCURL_PC_REQUIRES_PRIVATE "${LIBCURL_PC_REQUIRES_PRIVATE}")
   endif()
   if(LIBCURL_PC_LIBS_PRIVATE)