diff --git a/scripts/waifulib/compiler_optimizations.py b/scripts/waifulib/compiler_optimizations.py
index 3d653770..a0fd9b87 100644
--- a/scripts/waifulib/compiler_optimizations.py
+++ b/scripts/waifulib/compiler_optimizations.py
@@ -30,7 +30,7 @@ compiler_optimizations.CFLAGS['gottagofast'] = {
 }
 '''
 
-VALID_BUILD_TYPES = ['fastnative', 'fast', 'release', 'debug', 'sanitize', 'none']
+VALID_BUILD_TYPES = ['fastnative', 'fast', 'release', 'debug', 'sanitize', 'msan', 'none']
 
 LINKFLAGS = {
 	'common': {
@@ -38,6 +38,10 @@ LINKFLAGS = {
 		'gcc':   ['-Wl,--no-undefined'],
 		'owcc':  ['-Wl,option stack=512k']
 	},
+	'msan': {
+		'clang': ['-fsanitize=memory', '-pthread'],
+		'default': ['NO_MSAN_HERE']
+	},
 	'sanitize': {
 		'clang': ['-fsanitize=undefined', '-fsanitize=address', '-pthread'],
 		'gcc':   ['-fsanitize=undefined', '-fsanitize=address', '-pthread'],
@@ -81,6 +85,10 @@ CFLAGS = {
 		'owcc':    ['-O0', '-fno-omit-frame-pointer', '-funwind-tables', '-fno-omit-leaf-frame-pointer'],
 		'default': ['-O0']
 	},
+	'msan': {
+		'clang':   ['-O2', '-g', '-fno-omit-frame-pointer', '-fsanitize=memory', '-pthread'],
+		'default': ['NO_MSAN_HERE']
+	},
 	'sanitize': {
 		'msvc':    ['/Od', '/RTC1', '/Zi', '/fsanitize=address'],
 		'gcc':     ['-O0', '-fsanitize=undefined', '-fsanitize=address', '-pthread'],