diff --git a/tinyexpr.c b/tinyexpr.c
index bb734cb..f3bc4d8 100644
--- a/tinyexpr.c
+++ b/tinyexpr.c
@@ -350,11 +350,11 @@ static void optimize(te_expr *n) {
 }
 
 
-te_expr *te_compile(const char *expression, const te_variable *lookup, int lookup_len, int *error) {
+te_expr *te_compile(const char *expression, const te_variable *variables, int var_count, int *error) {
     state s;
     s.start = s.next = expression;
-    s.lookup = lookup;
-    s.lookup_len = lookup_len;
+    s.lookup = variables;
+    s.lookup_len = var_count;
 
     next_token(&s);
     te_expr *root = expr(&s);
diff --git a/tinyexpr.h b/tinyexpr.h
index 5a4def8..90ae90b 100644
--- a/tinyexpr.h
+++ b/tinyexpr.h
@@ -55,7 +55,7 @@ double te_interp(const char *expression, int *error);
 
 /* Parses the input expression and binds variables. */
 /* Returns NULL on error. */
-te_expr *te_compile(const char *expression, const te_variable *lookup, int lookup_len, int *error);
+te_expr *te_compile(const char *expression, const te_variable *variables, int var_count, int *error);
 
 /* Evaluates the expression. */
 double te_eval(const te_expr *n);