diff --git a/c-programming/experiments/floatscan-experiment.c b/c-programming/experiments/floatscan-experiment.c
index 6d1d322..adb6f3b 100644
--- a/c-programming/experiments/floatscan-experiment.c
+++ b/c-programming/experiments/floatscan-experiment.c
@@ -25,6 +25,11 @@
 #define FLOAT_TYPE 0
 #define DOUBLE_TYPE 1
 #define LONG_DOUBLE_TYPE 2
+
+static long long scanexp(FILE *f, int pok);
+static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int pok);
+static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok);
+long double __floatscan(FILE *f, int prec, int pok);
 /* wrapping code --- end */
 
 /* the original musl libc code --- beginning */