diff --git a/tools/cryptorf/Makefile b/tools/cryptorf/Makefile
index 82d1d591c..bc6b7c853 100644
--- a/tools/cryptorf/Makefile
+++ b/tools/cryptorf/Makefile
@@ -1,7 +1,7 @@
 MYSRCPATHS = ../../common ../../common/cryptorf
 MYSRCS = cryptolib.c util.c
 MYINCLUDES = -I../../common/cryptorf
-MYCFLAGS =
+MYCFLAGS = -O3
 MYDEFS =
 
 # build artifacts
diff --git a/tools/mf_nonce_brute/Makefile b/tools/mf_nonce_brute/Makefile
index 17ae04ddc..35711a460 100644
--- a/tools/mf_nonce_brute/Makefile
+++ b/tools/mf_nonce_brute/Makefile
@@ -1,7 +1,7 @@
 MYSRCPATHS = ../../common ../../common/crapto1
 MYSRCS = crypto1.c crapto1.c bucketsort.c iso14443crc.c sleep.c util_posix.c
 MYINCLUDES = -I../../include -I../../common
-MYCFLAGS =
+MYCFLAGS = -O3
 MYDEFS =
 MYLDLIBS =
 ifneq ($(SKIPPTHREAD),1)
diff --git a/tools/mfkey/Makefile b/tools/mfkey/Makefile
index fd6e37fd9..d1579a98b 100644
--- a/tools/mfkey/Makefile
+++ b/tools/mfkey/Makefile
@@ -1,7 +1,7 @@
 MYSRCPATHS = ../../common ../../common/crapto1
 MYSRCS = crypto1.c crapto1.c bucketsort.c
 MYINCLUDES = -I../../include -I../../common
-MYCFLAGS = -O3 --param max-completely-peeled-insns=1000 --param max-completely-peel-times=10000
+MYCFLAGS = -O3
 MYDEFS =
 
 BINS = mfkey32 mfkey32v2 mfkey64
@@ -16,6 +16,11 @@ ifneq (,$(findstring MINGW,$(platform)))
     CFLAGS += -D_ISOC99_SOURCE
 endif
 
+# macOS doesn't like these compiler params
+ifneq ($(platform),Darwin)
+    MYCFLAGS += --param max-completely-peeled-insns=1000 --param max-completely-peel-times=10000
+endif
+
 mfkey32 : $(OBJDIR)/mfkey32.o $(MYOBJS)
 mfkey32v2 : $(OBJDIR)/mfkey32v2.o $(MYOBJS)
 mfkey64 : $(OBJDIR)/mfkey64.o $(MYOBJS)