diff --git a/misc/macclassic/Makefile_68k b/misc/macclassic/Makefile_68k
index 56b774f0c..a960a2f54 100644
--- a/misc/macclassic/Makefile_68k
+++ b/misc/macclassic/Makefile_68k
@@ -4,6 +4,8 @@ RETRO68=../Retro68-build/toolchain
 PREFIX=$(RETRO68)/m68k-apple-macos
 CC=$(RETRO68)/bin/m68k-apple-macos-gcc
 CXX=$(RETRO68)/bin/m68k-apple-macos-g++
+CFLAGS=-O1 -fno-math-errno
+
 REZ=$(RETRO68)/bin/Rez
 
 LDFLAGS=-lRetroConsole
diff --git a/misc/macclassic/Makefile_ppc b/misc/macclassic/Makefile_ppc
index 4eee32cf8..bfc3f5d47 100644
--- a/misc/macclassic/Makefile_ppc
+++ b/misc/macclassic/Makefile_ppc
@@ -4,6 +4,8 @@ RETRO68=../Retro68-build/toolchain
 PREFIX=$(RETRO68)/powerpc-apple-macos
 CC=$(RETRO68)/bin/powerpc-apple-macos-gcc
 CXX=$(RETRO68)/bin/powerpc-apple-macos-g++
+CFLAGS=-O1 -fno-math-errno
+
 REZ=$(RETRO68)/bin/Rez
 MakePEF=$(RETRO68)/bin/MakePEF