diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ec0792c31..38d7b67478 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -838,6 +838,10 @@ if(CURL_USE_GNUTLS)
     pkg_check_modules(GNUTLS "gnutls")
     if(GNUTLS_FOUND)
       set(GNUTLS_LIBRARIES ${GNUTLS_LINK_LIBRARIES})
+      string(REPLACE ";" " " GNUTLS_CFLAGS "${GNUTLS_CFLAGS}")
+      if(GNUTLS_CFLAGS)
+        string(APPEND CMAKE_C_FLAGS " ${GNUTLS_CFLAGS}")
+      endif()
     endif()
   endif()
   if(NOT GNUTLS_FOUND)