diff --git a/code/unix/Makefile b/code/unix/Makefile
index 1ed167ec..50934320 100644
--- a/code/unix/Makefile
+++ b/code/unix/Makefile
@@ -245,7 +245,8 @@ ifeq ($(PLATFORM),darwin)
   GLIBC=
   CC=gcc
 
-  VM_PPC=vm_ppc_new
+  # !!! FIXME: calling conventions are still broken! See Bugzilla #2519
+  #VM_PPC=vm_ppc_new
 
   BASE_CFLAGS = -Wall -fno-strict-aliasing -Wimplicit -Wstrict-prototypes
   BASE_CFLAGS += -DMACOS_X -fno-common -pipe