diff --git a/src/RawFile.cpp b/src/RawFile.cpp
index 2c2f2c1..0cd712b 100644
--- a/src/RawFile.cpp
+++ b/src/RawFile.cpp
@@ -178,7 +178,9 @@ std::vector<ROI> get_rois_from_disabled_udp_ports(
         if (udp_port_types == std::vector<std::string>{"left", "right"}) {
             rois = merge_consecutive_rois<false, true>(rois);
         } else if (udp_port_types ==
-                   std::vector<std::string>{"bottom", "top"}) {
+                       std::vector<std::string>{"bottom", "top"} ||
+                   udp_port_types ==
+                       std::vector<std::string>{"top", "bottom"}) {
 
             LOG(logDEBUG) << fmt::format("ROIs before merging: {}",
                                          rois.size());
diff --git a/src/RawFile.test.cpp b/src/RawFile.test.cpp
index 4cf7a54..e2a7dc8 100644
--- a/src/RawFile.test.cpp
+++ b/src/RawFile.test.cpp
@@ -537,4 +537,40 @@ TEST_CASE("Read Eiger frame with disabled UDP ports",
         REQUIRE(frame.cols() == 512);
         REQUIRE(frame.rows() == 512);
     }
+    SECTION("2 full modules stacked vertically - right ports disabled") {
+        auto fpath = test_data_path() / "raw/eiger" /
+                     "2_modules_eiger_disabled_udp_port_master_0.json";
+
+        REQUIRE(std::filesystem::exists(fpath));
+        RawFile f(fpath);
+        REQUIRE(f.master().disabled_udp_ports().value() ==
+                std::vector<size_t>{1, 3, 5, 7});
+        REQUIRE(f.master().udp_port_types().value() ==
+                std::vector<std::string>{"left", "right"});
+        REQUIRE_THROWS_WITH(
+            f.read_frame(),
+            Catch::Matchers::ContainsSubstring(
+                "Multiple ROIs present in file. Use read_ROIs() "
+                "instead"));
+        auto frames = f.read_rois();
+        REQUIRE(frames.size() == 2);
+        REQUIRE(frames[0].cols() == 512);
+        REQUIRE(frames[0].rows() == 512);
+        REQUIRE(frames[1].cols() == 512);
+        REQUIRE(frames[1].rows() == 512);
+    }
+    SECTION("quad module - bottom port disabled") {
+        auto fpath = test_data_path() / "raw/eiger" /
+                     "quad_eiger_disabled_bottom_port_master_0.json";
+
+        REQUIRE(std::filesystem::exists(fpath));
+        RawFile f(fpath);
+        REQUIRE(f.master().disabled_udp_ports().value() ==
+                std::vector<size_t>{1});
+        REQUIRE(f.master().udp_port_types().value() ==
+                std::vector<std::string>{"top", "bottom"});
+        auto frame = f.read_frame();
+        REQUIRE(frame.cols() == 512);
+        REQUIRE(frame.rows() == 256);
+    }
 }
diff --git a/src/RawMasterFile.cpp b/src/RawMasterFile.cpp
index 0407411..73658fe 100644
--- a/src/RawMasterFile.cpp
+++ b/src/RawMasterFile.cpp
@@ -115,6 +115,10 @@ RawMasterFile::RawMasterFile(const std::filesystem::path &fpath)
     } else {
         throw std::runtime_error(LOCATION + "Unsupported file type");
     }
+
+    if (m_quad == 1 && m_udp_port_types.has_value()) {
+        m_udp_port_types.value() = {"top", "bottom"};
+    }
 }
 
 RawMasterFile::RawMasterFile(std::istream &is, const std::string &fname)