diff --git a/include/MetroidPrime/CMemoryCardDriver.hpp b/include/MetroidPrime/CMemoryCardDriver.hpp
index af31b12b..05b32fdd 100644
--- a/include/MetroidPrime/CMemoryCardDriver.hpp
+++ b/include/MetroidPrime/CMemoryCardDriver.hpp
@@ -110,8 +110,8 @@ private:
   CAssetId xc_saveIcon1;
   EState x10_state;
   EError x14_error;
-  int x18_cardFreeBytes;
-  int x1c_cardFreeFiles;
+  uint x18_cardFreeBytes;
+  uint x1c_cardFreeFiles;
   uint x20_fileTime;
   long long x28_cardSerial;
   rstl::reserved_vector< u8, 174 > x30_systemData;
diff --git a/src/MetroidPrime/CMemoryCardDriver.cpp b/src/MetroidPrime/CMemoryCardDriver.cpp
index 731f9e9c..3e706c28 100644
--- a/src/MetroidPrime/CMemoryCardDriver.cpp
+++ b/src/MetroidPrime/CMemoryCardDriver.cpp
@@ -431,7 +431,12 @@ void CMemoryCardDriver::ClearError() {
   x14_error = kE_OK;
 }
 
-void CMemoryCardDriver::CheckCardCapacity() {}
+void CMemoryCardDriver::CheckCardCapacity() {
+  if (x18_cardFreeBytes >= 0x2000 && x1c_cardFreeFiles >= 1) {
+    return;
+  }
+  x14_error = kE_CardStillFull;
+}
 
 void CMemoryCardDriver::NoCardFound() {}