diff --git a/Make.config b/Make.config
index bc9f8db11f42..61bb28c54be3 100644
--- a/Make.config
+++ b/Make.config
@@ -234,6 +234,7 @@ MONO_PREFIX ?= /Library/Frameworks/Mono.framework/Versions/Current
 SYSTEM_MCS=$(MONO_PREFIX)/bin/mcs
 SYSTEM_SN=$(MONO_PREFIX)/bin/sn
 SYSTEM_MONO=$(MONO_PREFIX)/bin/mono
+SYSTEM_MONO32=$(MONO_PREFIX)/bin/mono32
 SYSTEM_MKBUNDLE=$(MONO_PREFIX)/bin/mkbundle
 SYSTEM_XBUILD=$(MONO_PREFIX)/bin/xbuild
 SYSTEM_RESGEN=$(MONO_PREFIX)/bin/resgen
diff --git a/builds/Makefile b/builds/Makefile
index 1f7fc56bf329..6ab631068a5e 100644
--- a/builds/Makefile
+++ b/builds/Makefile
@@ -1906,7 +1906,7 @@ targetwatch/mono/arch/arm/arm_dpimacros.h: .stamp-configure-targetwatch
 define GenerateCrossOffsets
 $(3)/$(1).h: .stamp-configure-$(3) target7/mono/arch/arm/arm_dpimacros.h targetwatch/mono/arch/arm/arm_dpimacros.h $(4)/tools/offsets-tool/MonoAotOffsetsDumper.exe
 	$(Q) MONO_PATH=$(4)/tools/offsets-tool/CppSharp/osx_32 \
-	$(SYSTEM_MONO) $(4)/tools/offsets-tool/MonoAotOffsetsDumper.exe --abi $(1) --out $(2) --mono $(abspath $(4)) --maccore $(abspath $(TOP))
+	$(SYSTEM_MONO32) $(4)/tools/offsets-tool/MonoAotOffsetsDumper.exe --abi $(1) --out $(2) --mono $(abspath $(4)) --maccore $(abspath $(TOP))
 endef
 
 CROSS_BASE_CFLAGS=-DMONOTOUCH $(CROSS_BUILD_CFLAGS) $(CCACHE_CFLAGS)