diff --git a/drm/DrmMode.h b/drm/DrmMode.h
index c5790a5..5450daf 100644
--- a/drm/DrmMode.h
+++ b/drm/DrmMode.h
@@ -48,6 +48,12 @@
            (float)(mode_.vtotal * mode_.htotal) * 1000.0F;
   }
 
+  auto GetVSyncPeriodNs() const {
+    static const int kNanosecondsPerSecond = 1E9;
+    return static_cast<int32_t>(kNanosecondsPerSecond *
+                                double(1 / GetVRefresh()));
+  }
+
   auto GetName() const {
     return std::string(mode_.name) + "@" + std::to_string(GetVRefresh());
   }
diff --git a/hwc2_device/HwcDisplay.cpp b/hwc2_device/HwcDisplay.cpp
index 36333d2..9a9761b 100644
--- a/hwc2_device/HwcDisplay.cpp
+++ b/hwc2_device/HwcDisplay.cpp
@@ -320,7 +320,7 @@
       break;
     case HWC2::Attribute::VsyncPeriod:
       // in nanoseconds
-      *value = static_cast<int>(1E9 / hwc_config.mode.GetVRefresh());
+      *value = hwc_config.mode.GetVSyncPeriodNs();
       break;
     case HWC2::Attribute::DpiY:
       // ideally this should be vdisplay/mm_heigth, however mm_height
diff --git a/hwc3/ComposerClient.cpp b/hwc3/ComposerClient.cpp
index eb4e683..2efce8f 100644
--- a/hwc3/ComposerClient.cpp
+++ b/hwc3/ComposerClient.cpp
@@ -972,15 +972,13 @@
 
   const HwcDisplayConfigs& configs = display->GetDisplayConfigs();
   for (const auto& [id, config] : configs.hwc_configs) {
-    static const int kNanosecondsPerSecond = 1E9;
     configurations->emplace_back(
         DisplayConfiguration{.configId = static_cast<int32_t>(config.id),
                              .width = config.mode.GetRawMode().hdisplay,
                              .height = config.mode.GetRawMode().vdisplay,
                              .configGroup = static_cast<int32_t>(
                                  config.group_id),
-                             .vsyncPeriod = static_cast<int>(kNanosecondsPerSecond * double(
-                                 1 / config.mode.GetVRefresh()))});
+                             .vsyncPeriod = config.mode.GetVSyncPeriodNs()});
 
     if (configs.mm_width != 0) {
       // ideally this should be vdisplay/mm_heigth, however mm_height