diff --git a/scripts/fuzz_opt.py b/scripts/fuzz_opt.py
index 5b5b967897b..3561825151e 100755
--- a/scripts/fuzz_opt.py
+++ b/scripts/fuzz_opt.py
@@ -2808,7 +2808,7 @@ def get_random_opts():
                               if choice not in requires_closed_world]
 
     # core opts
-    while 1:
+    while True:
         choice = random.choice(usable_opt_choices)
         if '--flatten' in choice or '-O4' in choice:
             if has_flatten:
diff --git a/scripts/fuzz_passes.py b/scripts/fuzz_passes.py
index c2c7910a8dd..2cc12d0c6de 100755
--- a/scripts/fuzz_passes.py
+++ b/scripts/fuzz_passes.py
@@ -117,7 +117,7 @@ def simplify(passes):
 
     def pick_passes():
         ret = []
-        while 1:
+        while True:
             str_ret = str(ret)
             if random.random() < 0.1 and str_ret not in tested:
                 tested.add(str_ret)
@@ -126,7 +126,7 @@ def pick_passes():
 
     counter = 0
 
-    while 1:
+    while True:
         passes = pick_passes()
         print('>>> [' + str(counter) + '] testing:', ' '.join(passes))
         counter += 1
diff --git a/scripts/fuzz_passes_wast.py b/scripts/fuzz_passes_wast.py
index 97f29a7b415..97eb8e26336 100755
--- a/scripts/fuzz_passes_wast.py
+++ b/scripts/fuzz_passes_wast.py
@@ -108,7 +108,7 @@ def simplify(passes):
     def pick_passes():
         # return '--waka'.split(' ')
         ret = []
-        while 1:
+        while True:
             str_ret = str(ret)
             if random.random() < 0.5 and str_ret not in tested:
                 tested.add(str_ret)
@@ -117,7 +117,7 @@ def pick_passes():
 
     counter = 0
 
-    while 1:
+    while True:
         passes = pick_passes()
         print('>>> [' + str(counter) + '] testing:', ' '.join(passes))
         counter += 1
diff --git a/scripts/test/support.py b/scripts/test/support.py
index 6d06999e944..687d67a3cae 100644
--- a/scripts/test/support.py
+++ b/scripts/test/support.py
@@ -46,7 +46,7 @@ def to_end(j):
         depth = 1
         while depth > 0 and j < len(wast):
             if wast[j] == '"':
-                while 1:
+                while True:
                     j = wast.find('"', j + 1)
                     if wast[j - 1] == '\\':
                         continue