diff --git a/src/algorithms/signal_source/adapters/file_source_base.cc b/src/algorithms/signal_source/adapters/file_source_base.cc
index 48dd72881..cf7b2cef9 100644
--- a/src/algorithms/signal_source/adapters/file_source_base.cc
+++ b/src/algorithms/signal_source/adapters/file_source_base.cc
@@ -64,11 +64,11 @@ FileSourceBase::FileSourceBase(ConfigurationInterface const* configuration, std:
       // Configuration for attaching extra data to the sample stream
       attach_extra_data_(configuration->property(role_ + ".extra_data.enabled"s, false)),
       ed_path_(configuration->property(role_ + ".extra_data.filename"s, "../data/extra_data.dat"s)),
-      ed_offset_in_file_(configuration->property(role_ + ".extra_data.file_offset"s, std::size_t{0UL})),
-      ed_item_size_(configuration->property(role_ + ".extra_data.item_size"s, std::size_t{1UL})),
+      ed_offset_in_file_(configuration->property(role_ + ".extra_data.file_offset"s, uint64_t{0UL})),
+      ed_item_size_(configuration->property(role_ + ".extra_data.item_size"s, uint64_t{1UL})),
       ed_repeat_(configuration->property(role_ + ".extra_data.repeat"s, false)),
-      ed_offset_in_samples_(configuration->property(role_ + ".extra_data.sample_offset"s, std::size_t{0UL})),
-      ed_sample_period_(configuration->property(role_ + ".extra_data.sample_period"s, std::size_t{1UL}))
+      ed_offset_in_samples_(configuration->property(role_ + ".extra_data.sample_offset"s, uint64_t{0UL})),
+      ed_sample_period_(configuration->property(role_ + ".extra_data.sample_period"s, uint64_t{1UL}))
 {
     minimum_tail_s_ = std::max(configuration->property("Acquisition_1C.coherent_integration_time_ms", 0.0) * 0.001 * 2.0, minimum_tail_s_);
     minimum_tail_s_ = std::max(configuration->property("Acquisition_2S.coherent_integration_time_ms", 0.0) * 0.001 * 2.0, minimum_tail_s_);
diff --git a/src/algorithms/signal_source/adapters/file_source_base.h b/src/algorithms/signal_source/adapters/file_source_base.h
index 9cc012cf7..534f2369b 100644
--- a/src/algorithms/signal_source/adapters/file_source_base.h
+++ b/src/algorithms/signal_source/adapters/file_source_base.h
@@ -187,11 +187,11 @@ private:
     // Configuration for Extra Data source
     bool attach_extra_data_;
     std::string ed_path_;
-    std::size_t ed_offset_in_file_;
-    std::size_t ed_item_size_;
+    uint64_t ed_offset_in_file_;
+    uint64_t ed_item_size_;
     bool ed_repeat_;
-    std::size_t ed_offset_in_samples_;
-    std::size_t ed_sample_period_;
+    uint64_t ed_offset_in_samples_;
+    uint64_t ed_sample_period_;
 };
 
 /** \} */