diff --git a/mwparserfromhell/parser/contexts.py b/mwparserfromhell/parser/contexts.py
index 9e5e568..211136c 100644
--- a/mwparserfromhell/parser/contexts.py
+++ b/mwparserfromhell/parser/contexts.py
@@ -85,43 +85,45 @@ Global contexts:
 
 # Local contexts:
 
-TEMPLATE =             0b000000000000000000000111
-TEMPLATE_NAME =        0b000000000000000000000001
-TEMPLATE_PARAM_KEY =   0b000000000000000000000010
-TEMPLATE_PARAM_VALUE = 0b000000000000000000000100
-
-ARGUMENT =             0b000000000000000000011000
-ARGUMENT_NAME =        0b000000000000000000001000
-ARGUMENT_DEFAULT =     0b000000000000000000010000
-
-WIKILINK =             0b000000000000000001100000
-WIKILINK_TITLE =       0b000000000000000000100000
-WIKILINK_TEXT =        0b000000000000000001000000
-
-HEADING =              0b000000000001111110000000
-HEADING_LEVEL_1 =      0b000000000000000010000000
-HEADING_LEVEL_2 =      0b000000000000000100000000
-HEADING_LEVEL_3 =      0b000000000000001000000000
-HEADING_LEVEL_4 =      0b000000000000010000000000
-HEADING_LEVEL_5 =      0b000000000000100000000000
-HEADING_LEVEL_6 =      0b000000000001000000000000
-
-COMMENT =              0b000000000010000000000000
-
-TAG =                  0b000000111100000000000000
-TAG_OPEN =             0b000000000100000000000000
-TAG_ATTR =             0b000000001000000000000000
-TAG_BODY =             0b000000010000000000000000
-TAG_CLOSE =            0b000000100000000000000000
-
-SAFETY_CHECK =         0b111111000000000000000000
-HAS_TEXT =             0b000001000000000000000000
-FAIL_ON_TEXT =         0b000010000000000000000000
-FAIL_NEXT  =           0b000100000000000000000000
-FAIL_ON_LBRACE =       0b001000000000000000000000
-FAIL_ON_RBRACE =       0b010000000000000000000000
-FAIL_ON_EQUALS =       0b100000000000000000000000
+TEMPLATE_NAME =        1 << 0
+TEMPLATE_PARAM_KEY =   1 << 1
+TEMPLATE_PARAM_VALUE = 1 << 2
+TEMPLATE = TEMPLATE_NAME + TEMPLATE_PARAM_KEY + TEMPLATE_PARAM_VALUE
+
+ARGUMENT_NAME =    1 << 3
+ARGUMENT_DEFAULT = 1 << 4
+ARGUMENT = ARGUMENT_NAME + ARGUMENT_DEFAULT
+
+WIKILINK_TITLE = 1 << 5
+WIKILINK_TEXT =  1 << 6
+WIKILINK = WIKILINK_TITLE + WIKILINK_TEXT
+
+HEADING_LEVEL_1 = 1 << 7
+HEADING_LEVEL_2 = 1 << 8
+HEADING_LEVEL_3 = 1 << 9
+HEADING_LEVEL_4 = 1 << 10
+HEADING_LEVEL_5 = 1 << 11
+HEADING_LEVEL_6 = 1 << 12
+HEADING = (HEADING_LEVEL_1 + HEADING_LEVEL_2 + HEADING_LEVEL_3 +
+           HEADING_LEVEL_4 + HEADING_LEVEL_5 + HEADING_LEVEL_6)
+
+COMMENT = 1 << 13
+
+TAG_OPEN =  1 << 14
+TAG_ATTR =  1 << 15
+TAG_BODY =  1 << 16
+TAG_CLOSE = 1 << 17
+TAG = TAG_OPEN + TAG_ATTR + TAG_BODY + TAG_CLOSE
+
+HAS_TEXT =       1 << 18
+FAIL_ON_TEXT =   1 << 19
+FAIL_NEXT  =     1 << 20
+FAIL_ON_LBRACE = 1 << 21
+FAIL_ON_RBRACE = 1 << 22
+FAIL_ON_EQUALS = 1 << 23
+SAFETY_CHECK = (HAS_TEXT + FAIL_ON_TEXT + FAIL_NEXT + FAIL_ON_LBRACE +
+                FAIL_ON_RBRACE + FAIL_ON_EQUALS)
 
 # Global contexts:
 
-GL_HEADING = 0b1
+GL_HEADING = 1 << 0