diff --git a/Makefile b/Makefile
index c83e9bb1..654cb433 100644
--- a/Makefile
+++ b/Makefile
@@ -68,7 +68,9 @@ LPTHREAD=
 SNAPSHOT_TARGET = $(DIST_DIR)/tyrutils-$(TYR_VERSION_NUM)-win32.zip
 # request standard-compilant snprintf in case we are using mingw-w64
 # (see http://sourceforge.net/p/mingw-w64/wiki2/printf%20and%20scanf%20family/)
-CFLAGS += -D__USE_MINGW_ANSI_STDIO=1 -m64
+#
+# -mstackrealign is to work around mingw + sse segfaults, see https://github.com/nothings/stb/issues/81
+CFLAGS += -D__USE_MINGW_ANSI_STDIO=1 -march=pentium4 -mfpmath=sse -mstackrealign
 ifneq ($(HOST_OS),WIN32)
 TARGET ?= $(MINGW32_CROSS_GUESS)
 CC = $(TARGET)-gcc
@@ -79,7 +81,7 @@ ifeq ($(TARGET_OS),WIN64)
 EXT=.exe
 DPTHREAD=
 LPTHREAD=
-CFLAGS += -D__USE_MINGW_ANSI_STDIO=1 -m64
+CFLAGS += -D__USE_MINGW_ANSI_STDIO=1 -march=pentium4 -mfpmath=sse -mstackrealign
 ifneq ($(HOST_OS),WIN64)
 TARGET ?= $(MINGW64_CROSS_GUESS)
 CC = $(TARGET)-gcc