diff --git a/libs/string.h b/libs/string.h
index c6b4779..343c951 100644
--- a/libs/string.h
+++ b/libs/string.h
@@ -48,7 +48,7 @@ char* float2Str(float* num) {
 }
 char* double2Str(double* num) {
     char* buffer = malloc(311);
-    sprintf(buffer, "%f", *num);
+    sprintf(buffer, "%lf", *num);
     return buffer;
 }
 // -------------- END ------------------