diff --git a/Utilities/cmlibuv/CMakeLists.txt b/Utilities/cmlibuv/CMakeLists.txt
index 6632a1ef9568edff9fb51104c4e73b03012e463f..b6e794146a8593a2383532fc4d8d9606f5c721aa 100644
--- a/Utilities/cmlibuv/CMakeLists.txt
+++ b/Utilities/cmlibuv/CMakeLists.txt
@@ -221,13 +221,22 @@ if(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
     __EXTENSIONS__
     )
   if(CMAKE_SYSTEM_VERSION STREQUAL "5.10")
+    set(CMAKE_C_STANDARD 90)
+    if(CMAKE_VERSION VERSION_LESS 3.8.20170504 AND CMAKE_C_COMPILER_ID STREQUAL "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.14)
+      # The running version of CMake does not know how to add this flag.
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c90")
+    endif()
     list(APPEND uv_defines
       _XOPEN_SOURCE=500
       )
-    if(CMAKE_C_STANDARD)
-      set(CMAKE_C_STANDARD 90)
-    endif()
   else()
+    if(NOT CMAKE_C_STANDARD OR CMAKE_C_STANDARD EQUAL 90)
+      set(CMAKE_C_STANDARD 11)
+    endif()
+    if(CMAKE_VERSION VERSION_LESS 3.8.20170505 AND CMAKE_C_COMPILER_ID STREQUAL "SunPro" AND CMAKE_C_COMPILER_VERSION VERSION_LESS 5.14)
+      # The running version of CMake does not know how to add this flag.
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -xc99")
+    endif()
     list(APPEND uv_defines
       _XOPEN_SOURCE=600
       )