diff --git a/SHSTKMacros.cmake b/SHSTKMacros.cmake
index a2954dc..d097e94 100644
--- a/SHSTKMacros.cmake
+++ b/SHSTKMacros.cmake
@@ -317,8 +317,8 @@ macro(shstk_find_header domain module filename add_find_info)
 		set(${domain}_INCLUDES "${_inc}" CACHE STRING "")
 		#endif()
 		include(CheckSymbolExists)
-		check_symbol_exists(${module}_VERSION_NAME "${${domain}_H_INCLUDE}" _version_found)
-		if (_version_found)
+		check_symbol_exists(${module}_VERSION_NAME "${${domain}_H_INCLUDE}" _${domain}_version_found)
+		if (_${domain}_version_found)
 			file(STRINGS "${${domain}_H_INCLUDE}" _version REGEX "^[ \t]*#define[ \t]+${module}_VERSION_NAME+[ \t]+.*$")
 			string(REGEX MATCH "\".*\"" _version ${_version})
 			string(LENGTH ${_version} SL)