diff --git a/lark/grammars/common.g b/lark/grammars/common.g
index c38f485..2bd02d0 100644
--- a/lark/grammars/common.g
+++ b/lark/grammars/common.g
@@ -12,7 +12,7 @@ DECIMAL: INT "." INT? | "." INT
 // float = /-?\d+(\.\d+)?([eE][+-]?\d+)?/
 _EXP: ("e"|"E") SIGNED_INT
 FLOAT: INT _EXP | DECIMAL _EXP?
-SIGNED_FLOAT: ["+"|"-"] INT
+SIGNED_FLOAT: ["+"|"-"] FLOAT
 
 NUMBER: FLOAT | INT
 SIGNED_NUMBER: ["+"|"-"] NUMBER