diff --git a/c-programming/experiments/floatscan-experiment.c b/c-programming/experiments/floatscan-experiment.c
index 683eb05..5c8cdb2 100644
--- a/c-programming/experiments/floatscan-experiment.c
+++ b/c-programming/experiments/floatscan-experiment.c
@@ -47,9 +47,9 @@
 /* wrapping code --- beginning */
 const char* fgetc_ptr = NULL;
 
-int __shgetc(void);
-int __shunget(void);
-long double floatscan(const char* s, int prec);
+static int __shgetc(void);
+static int __shunget(void);
+static long double floatscan(const char* s, int prec);
 
 #define shgetc(f) __shgetc()
 #define shlim(...)
@@ -567,16 +567,16 @@ long double __floatscan(FILE *f, int prec, int pok)
 /* the original musl libc code --- end */
 
 /* wrapping code --- beginning */
-int __shgetc(void) {
+static int __shgetc(void) {
 	return *fgetc_ptr++;
 }
 
-int __shunget(void) {
+static int __shunget(void) {
 	fgetc_ptr--;
 	return 0;
 }
 
-long double floatscan(const char* s, int prec) {
+static long double floatscan(const char* s, int prec) {
 	fgetc_ptr = s;
 	return __floatscan(NULL, prec, 1);
 }