diff --git a/ThirdParty/Ert/lib/ecl/ecl_util.cpp b/ThirdParty/Ert/lib/ecl/ecl_util.cpp index f0ddca45dd..d8efe8c7b1 100644 --- a/ThirdParty/Ert/lib/ecl/ecl_util.cpp +++ b/ThirdParty/Ert/lib/ecl/ecl_util.cpp @@ -355,7 +355,11 @@ static bool valid_base(const char * input_base, bool * upper_case) { if (upper_case) *upper_case = upper; - return !(lower && upper); + + // Disable checking of mixed upper and lower case + // https://github.com/OPM/ResInsight/issues/9529 + return true; + }