diff --git a/ThirdParty/custom-opm-common/opm-common/opm/io/eclipse/EclUtil.hpp b/ThirdParty/custom-opm-common/opm-common/opm/io/eclipse/EclUtil.hpp
index 7492225c45..081409fad6 100644
--- a/ThirdParty/custom-opm-common/opm-common/opm/io/eclipse/EclUtil.hpp
+++ b/ThirdParty/custom-opm-common/opm-common/opm/io/eclipse/EclUtil.hpp
@@ -39,7 +39,7 @@ namespace Opm { namespace EclIO {
     bool is_number(const std::string& numstr);
 
     bool isEqualCaseInsensitive(const std::string& string1, const std::string& string2);
-    Opm::filesystem::path findFileCaseInsensitive(const std::filesystem::path& folder, const std::string& filename);
+    Opm::filesystem::path findFileCaseInsensitive(const Opm::filesystem::path& folder, const std::string& filename);
 
     std::tuple<int, int> block_size_data_binary(eclArrType arrType);
     std::tuple<int, int, int> block_size_data_formatted(eclArrType arrType);
diff --git a/ThirdParty/custom-opm-common/opm-common/src/opm/io/eclipse/EclUtil.cpp b/ThirdParty/custom-opm-common/opm-common/src/opm/io/eclipse/EclUtil.cpp
index 94aa3dc353..4b8d567125 100644
--- a/ThirdParty/custom-opm-common/opm-common/src/opm/io/eclipse/EclUtil.cpp
+++ b/ThirdParty/custom-opm-common/opm-common/src/opm/io/eclipse/EclUtil.cpp
@@ -94,9 +94,9 @@ bool Opm::EclIO::isEqualCaseInsensitive(const std::string& string1, const std::s
     return string1LowerCase == string2LowerCase;
 }
 
-std::filesystem::path Opm::EclIO::findFileCaseInsensitive(const std::filesystem::path& folder, const std::string& filename)
+Opm::filesystem::path Opm::EclIO::findFileCaseInsensitive(const Opm::filesystem::path& folder, const std::string& filename)
 {
-    for (auto& p : std::filesystem::directory_iterator(folder)) {
+    for (auto& p : Opm::filesystem::directory_iterator(folder)) {
         std::string candidate = p.path().filename().string();
 
         if (isEqualCaseInsensitive(filename, candidate)) return p.path();