diff --git a/src/scanner.c b/src/scanner.c
index 269f6b2..49096a0 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -132,8 +132,8 @@ static inline bool process_float_literal(TSLexer *lexer) {
     if (lexer->lookahead == '.') {
         has_fraction = true;
         advance(lexer);
-        if (iswalpha(lexer->lookahead)) {
-            // The dot is followed by a letter: 1.max(2) => not a float but an integer
+        if (iswalpha(lexer->lookahead) || lexer->lookahead == '_') {
+            // The dot is followed by a letter or _: 1.max(2) => not a float but an integer
             return false;
         }
 
diff --git a/test/corpus/expressions.txt b/test/corpus/expressions.txt
index 998d590..8c22904 100644
--- a/test/corpus/expressions.txt
+++ b/test/corpus/expressions.txt
@@ -994,6 +994,7 @@ mystruct.myfield;
 foo().x;
 value.0.1.iter();
 1.max(2);
+1._method();
 
 --------------------------------------------------------------------------------
 
@@ -1024,7 +1025,13 @@ value.0.1.iter();
         (integer_literal)
         (field_identifier))
       (arguments
-        (integer_literal)))))
+        (integer_literal))))
+  (expression_statement
+    (call_expression
+      (field_expression
+        (integer_literal)
+        (field_identifier))
+      (arguments))))
 
 ================================================================================
 Method call expressions