diff --git a/src/sdf/ftsdf.c b/src/sdf/ftsdf.c
index 1f03fd413..46ef7b14d 100644
--- a/src/sdf/ftsdf.c
+++ b/src/sdf/ftsdf.c
@@ -497,7 +497,7 @@
       goto Exit;
     }
 
-    if ( !FT_QALLOC( ptr, sizeof ( *ptr ) ) )
+    if ( !FT_QNEW( ptr ) )
     {
       *ptr = null_edge;
       *edge = ptr;
@@ -536,7 +536,7 @@
       goto Exit;
     }
 
-    if ( !FT_QALLOC( ptr, sizeof ( *ptr ) ) )
+    if ( !FT_QNEW( ptr ) )
     {
       *ptr     = null_contour;
       *contour = ptr;
@@ -591,7 +591,7 @@
       goto Exit;
     }
 
-    if ( !FT_QALLOC( ptr, sizeof ( *ptr ) ) )
+    if ( !FT_QNEW( ptr ) )
     {
       *ptr        = null_shape;
       ptr->memory = memory;