diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 2698745c..d27a5086 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -822,10 +822,10 @@ JITSRCS="compemu1.cpp compemu2.cpp compemu3.cpp compemu4.cpp compemu5.cpp compem
 
 if [[ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_I386" = "xyes" -a "x$OS_TYPE" != "xfreebsd" ]]; then
   dnl i386 CPU
-  DEFINES="$DEFINES -DREGPARAM=\"__attribute__((regparm(3)))\""
+  DEFINES="$DEFINES -DSAHF_SETO_PROFITABLE -DUNALIGNED_PROFITABLE -DREGPARAM=\"__attribute__((regparm(3)))\""
   if [[ "x$HAVE_GAS" = "xyes" ]]; then
     ASM_OPTIMIZATIONS=i386
-    DEFINES="$DEFINES -DX86_ASSEMBLY -DUNALIGNED_PROFITABLE -DOPTIMIZED_FLAGS"
+    DEFINES="$DEFINES -DX86_ASSEMBLY -DOPTIMIZED_FLAGS"
     CPUSRCS="cpufast1.s cpufast2.s cpufast3.s cpufast4.s cpufast5.s cpufast6.s cpufast7.s cpufast8.s"
     JITSRCS="cpufast1_nf.s cpufast2_nf.s cpufast3_nf.s cpufast4_nf.s cpufast5_nf.s cpufast6_nf.s cpufast7_nf.s cpufast8_nf.s $JITSRCS"
   fi