diff --git a/src/bee_version_compare.c b/src/bee_version_compare.c
index 9706228..6514fe8 100644
--- a/src/bee_version_compare.c
+++ b/src/bee_version_compare.c
@@ -34,7 +34,7 @@
 // '2.23.001'  == '2.23.1'
 // '2.23.1001' >  '2.23.101'
 
-int compare_version_strings(char *a, char *b) {
+static int compare_version_strings(char *a, char *b) {
     while (1) {
 
         if (isdigit(*a) && isdigit (*b)) {
diff --git a/src/bee_version_compare.h b/src/bee_version_compare.h
index 5af38ef..3a333fb 100644
--- a/src/bee_version_compare.h
+++ b/src/bee_version_compare.h
@@ -24,7 +24,6 @@
 
 #include "bee_version.h"
 
-int compare_version_strings(char *v1, char *v2);
 int compare_beepackage_names(struct beeversion *v1, struct beeversion *v2);
 int compare_beeversions(struct beeversion *v1, struct beeversion *v2);
 int compare_beepackages(struct beeversion *v1, struct beeversion *v2);