diff --git a/sys/windows/consoletty.c b/sys/windows/consoletty.c
index 5b5b77070..65462ef47 100644
--- a/sys/windows/consoletty.c
+++ b/sys/windows/consoletty.c
@@ -2513,10 +2513,10 @@ void nethack_enter_consoletty(void)
     /* setup front and back buffers */
     int buffer_size_bytes = sizeof(cell_t) * console.buffer_size;
 
-    console.front_buffer = (cell_t *)malloc(buffer_size_bytes);
+    console.front_buffer = (cell_t *)alloc(buffer_size_bytes);
     buffer_fill_to_end(console.front_buffer, &undefined_cell, 0, 0);
 
-    console.back_buffer = (cell_t *)malloc(buffer_size_bytes);
+    console.back_buffer = (cell_t *)alloc(buffer_size_bytes);
     buffer_fill_to_end(console.back_buffer, &clear_cell, 0, 0);
 
     /* determine whether OS version has unicode support */
diff --git a/sys/windows/windsys.c b/sys/windows/windsys.c
index a951ea6fe..bd8a9871f 100644
--- a/sys/windows/windsys.c
+++ b/sys/windows/windsys.c
@@ -677,7 +677,7 @@ BOOL winos_font_support_cp437(HFONT hFont)
 
     DWORD size = (size_t) GetFontUnicodeRanges(hdc, NULL);
     if (size) {
-        GLYPHSET *glyphSet = (GLYPHSET *) malloc((size_t) size);
+        GLYPHSET *glyphSet = (GLYPHSET *) alloc((size_t) size);
         if (glyphSet != NULL) {
 #ifdef _MSC_VER
 #pragma warning( push )