diff --git a/src/Aquarium.cpp b/src/Aquarium.cpp
index 24f0cf9..a6cc3eb 100644
--- a/src/Aquarium.cpp
+++ b/src/Aquarium.cpp
@@ -106,9 +106,9 @@ void Aquarium::getTerminalSize() {
     height = ws.ws_row;
     width = ws.ws_col;
   } else {
-    // Fallback
-    height = 24;
-    width = 80;
+    cleanup_terminal(0);
+    std::cerr << "Error: Unable to determine terminal size.\n";
+    std::exit(1);
   }
 }