diff --git a/resources/numex/en.yaml b/resources/numex/en.yaml
index cd11f79e..5e35fe06 100644
--- a/resources/numex/en.yaml
+++ b/resources/numex/en.yaml
@@ -9,6 +9,7 @@
       name: "oh"
       value: 0
       type: "cardinal"
+      left: "concat_only_if_number"
     - 
       name: "one"
       value: 1
diff --git a/scripts/geodata/numbers/numex.py b/scripts/geodata/numbers/numex.py
index b1d09b62..558a4e6b 100644
--- a/scripts/geodata/numbers/numex.py
+++ b/scripts/geodata/numbers/numex.py
@@ -47,11 +47,13 @@ category_map = {
 
 LEFT_CONTEXT_MULTIPLY = 'NUMEX_LEFT_CONTEXT_MULTIPLY'
 LEFT_CONTEXT_ADD = 'NUMEX_LEFT_CONTEXT_ADD'
+LEFT_CONTEXT_CONCAT_ONLY_IF_NUMBER = 'NUMEX_LEFT_CONTEXT_CONCAT_ONLY_IF_NUMBER'
 LEFT_CONTEXT_NONE = 'NUMEX_LEFT_CONTEXT_NONE'
 
 left_context_map = {
     'add': LEFT_CONTEXT_ADD,
     'multiply': LEFT_CONTEXT_MULTIPLY,
+    'concat_only_if_number': LEFT_CONTEXT_CONCAT_ONLY_IF_NUMBER,
     None: LEFT_CONTEXT_NONE,
 }
 
diff --git a/src/numex.h b/src/numex.h
index d80f96e1..5b289f13 100644
--- a/src/numex.h
+++ b/src/numex.h
@@ -50,7 +50,8 @@ typedef enum {
 typedef enum {
     NUMEX_LEFT_CONTEXT_NONE,
     NUMEX_LEFT_CONTEXT_ADD,
-    NUMEX_LEFT_CONTEXT_MULTIPLY
+    NUMEX_LEFT_CONTEXT_MULTIPLY,
+    NUMEX_LEFT_CONTEXT_CONCAT_ONLY_IF_NUMBER
 } numex_left_context;
 
 typedef enum {