diff --git a/app/src/util/str_util.c b/app/src/util/str_util.c
index df7fa25c..287c08de 100644
--- a/app/src/util/str_util.c
+++ b/app/src/util/str_util.c
@@ -10,18 +10,6 @@
 # include <tchar.h>
 #endif
 
-size_t
-xargvlen(const char *const *argv, size_t *n_args) {
-    size_t i, len = 0;
-    for (i = 0; argv[i]; i++) {
-        len += strlen(argv[i]);
-        if(i != 0) len += 1; /* extra for space */
-    }
-    if (n_args) *n_args = i;
-
-    return len;
-}
-
 size_t
 xstrncpy(char *dest, const char *src, size_t n) {
     size_t i;
diff --git a/app/src/util/str_util.h b/app/src/util/str_util.h
index 2f43e50f..361d2bdd 100644
--- a/app/src/util/str_util.h
+++ b/app/src/util/str_util.h
@@ -6,10 +6,6 @@
 #include <stdbool.h>
 #include <stddef.h>
 
-// returns the flat buffer size large enough to store all argv elements (excluding nul terminator) plus separating spaces
-size_t
-xargvlen(const char * const argv[], size_t *n_args);
-
 // like strncpy, except:
 //  - it copies at most n-1 chars
 //  - the dest string is nul-terminated