diff --git a/uncompyle6/parsers/parse37.py b/uncompyle6/parsers/parse37.py
index c6cee373..e9af945a 100644
--- a/uncompyle6/parsers/parse37.py
+++ b/uncompyle6/parsers/parse37.py
@@ -117,10 +117,10 @@ class Python37Parser(Python36Parser):
 
         and_not                    ::= expr jmp_false expr POP_JUMP_IF_TRUE
 
-        expr                       ::= ifexp_37a
-        expr                       ::= ifexp_37b
-        ifexp_37a                  ::= and_not expr JUMP_FORWARD COME_FROM expr COME_FROM
-        ifexp_37b                  ::= expr jmp_false expr POP_JUMP_IF_FALSE jump_forward_else expr
+        expr                       ::= if_exp_37a
+        expr                       ::= if_exp_37b
+        if_exp_37a                 ::= and_not expr JUMP_FORWARD COME_FROM expr COME_FROM
+        if_exp_37b                 ::= expr jmp_false expr POP_JUMP_IF_FALSE jump_forward_else expr
         """
 
     def customize_grammar_rules(self, tokens, customize):
diff --git a/uncompyle6/semantics/customize37.py b/uncompyle6/semantics/customize37.py
index eb46ddf6..b07ea563 100644
--- a/uncompyle6/semantics/customize37.py
+++ b/uncompyle6/semantics/customize37.py
@@ -23,8 +23,8 @@ def customize_for_version37(self, version):
     #######################
 
     PRECEDENCE['attribute37'] =  2
-    PRECEDENCE['ifexp_37a']   = 28
-    PRECEDENCE['ifexp_37b']   = 28
+    PRECEDENCE['if_exp_37a']   = 28
+    PRECEDENCE['if_exp_37b']   = 28
 
     TABLE_DIRECT.update({
         'and_not':  ( '%c and not %c',
@@ -59,7 +59,7 @@ def customize_for_version37(self, version):
             (0, 19 ) ),
         'compare_chained2c_37': (
             '%[3]{pattr.replace("-", " ")} %p %p', (0, 19), (6, 19) ),
-        'ifexp_37a': ( '%p if %p else %p', (1, 'expr', 27), (0, 27), (4, 'expr', 27) ),
-        'ifexp_37b': ( '%p if %p else %p', (2, 'expr', 27), (0, 'expr', 27), (5, 'expr', 27) ),
+        'if_exp_37a': ( '%p if %p else %p', (1, 'expr', 27), (0, 27), (4, 'expr', 27) ),
+        'if_exp_37b': ( '%p if %p else %p', (2, 'expr', 27), (0, 'expr', 27), (5, 'expr', 27) ),
 
         })