diff --git a/src/main/c/testForNumber.c b/src/main/c/testForNumber.c
index 06438d1..06654b6 100644
--- a/src/main/c/testForNumber.c
+++ b/src/main/c/testForNumber.c
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 #include <math.h>
 
-#include "taschenrechner.h"
+#include "calculator.h"
 
 double testForNumber() {
     double num;
@@ -27,4 +27,4 @@ double testForNumber() {
     } while (!isspace(*notANumber) && *notANumber != 0);
 
     return num;
-}
\ No newline at end of file
+}