diff --git a/src/Hyprpaper.cpp b/src/Hyprpaper.cpp
index 361d30e..70ebde8 100644
--- a/src/Hyprpaper.cpp
+++ b/src/Hyprpaper.cpp
@@ -136,8 +136,13 @@ void CHyprpaper::recheckMonitor(SMonitor* pMonitor) {
         zwlr_layer_surface_v1_ack_configure(pMonitor->pCurrentLayerSurface->pLayerSurface, pMonitor->configureSerial);
 
         int XCURSOR_SIZE = 24;
-        if (getenv("XCURSOR_SIZE")) {
-            XCURSOR_SIZE = std::stoi(getenv("XCURSOR_SIZE"));
+        if (getenv("XCURSOR_SIZE") != NULL) {
+            char *endptr;
+            XCURSOR_SIZE = strtol(getenv("XCURSOR_SIZE"), &endptr, 10);
+            if (*endptr || XCURSOR_SIZE <= 0) {
+                Debug::log(WARN, "XCURSOR_SIZE environment variable is set incorrectly");
+                XCURSOR_SIZE = 24;
+            }
         }
 
         pMonitor->pCurrentLayerSurface->pCursorImg = wl_cursor_theme_get_cursor(wl_cursor_theme_load(getenv("XCURSOR_THEME"), XCURSOR_SIZE * pMonitor->scale, m_sSHM), "left_ptr")->images[0];
@@ -233,9 +238,9 @@ void CHyprpaper::clearWallpaperFromMonitor(const std::string& monname) {
 
     if (it != m_mMonitorActiveWallpaperTargets.end())
         m_mMonitorActiveWallpaperTargets.erase(it);
-    
+
     if (PMONITOR->pCurrentLayerSurface) {
-        
+
         PMONITOR->pCurrentLayerSurface = nullptr;
 
         PMONITOR->wantsACK = false;
@@ -256,7 +261,7 @@ void CHyprpaper::ensureMonitorHasActiveWallpaper(SMonitor* pMonitor) {
         it = m_mMonitorActiveWallpaperTargets.find(pMonitor);
     }
 
-    if (it->second) 
+    if (it->second)
         return; // has
 
     // get the target
@@ -296,7 +301,7 @@ void CHyprpaper::ensureMonitorHasActiveWallpaper(SMonitor* pMonitor) {
     // create it for thy if it doesnt have
     if (!pMonitor->pCurrentLayerSurface)
         createLSForMonitor(pMonitor);
-    else    
+    else
         pMonitor->wantsReload = true;
 }