diff --git a/src/core/alloc_func.cpp b/src/core/alloc_func.cpp
--- a/src/core/alloc_func.cpp
+++ b/src/core/alloc_func.cpp
@@ -11,7 +11,7 @@
  */
 void NORETURN MallocError(size_t size)
 {
-	error("Out of memory. Cannot allocate %i bytes", size);
+	error("Out of memory. Cannot allocate " PRINTF_SIZE " bytes", size);
 }
 
 /**
@@ -20,5 +20,5 @@ void NORETURN MallocError(size_t size)
  */
 void NORETURN ReallocError(size_t size)
 {
-	error("Out of memory. Cannot reallocate %i bytes", size);
+	error("Out of memory. Cannot reallocate " PRINTF_SIZE " bytes", size);
 }