diff --git a/include/gpu.hpp b/include/gpu.hpp
index 428407a..58e7e6e 100644
--- a/include/gpu.hpp
+++ b/include/gpu.hpp
@@ -4,10 +4,6 @@
 #include <cstdint>
 #include <string>
 
-
-#define REL_METRICS_PATH "/../../gpu_metrics"  // gpu_metrics path relative to hwmon path
-#define MAX_METRICS_LENGTH 512                 // length of the metrics buffer
-
 /* clean abstraction for gpu_metrics or metrics in filesystem in sane units */
 
 namespace gpu {
diff --git a/src/gpu.cpp b/src/gpu.cpp
index 8fab334..abff8e2 100644
--- a/src/gpu.cpp
+++ b/src/gpu.cpp
@@ -9,6 +9,9 @@
 
 namespace gpu {
 
+const std::string rel_metrics_path = "/../../gpu_metrics";  // gpu_metrics path relative to hwmon path
+constexpr uint16_t max_metrics_length = 512;                 // length of the metrics buffer
+
 /* takes pointer to a target gpu::sensors struct and updates its hwmon path and detects gpu_metrics */
 void detectHwmon(gpuSensors* target, const std::string& pci) {
     target->hwmon = utils::getFirstDir("/sys/bus/pci/devices/" + pci + "/hwmon");