diff --git a/jv.c b/jv.c
index 020e65b9..b93854b3 100644
--- a/jv.c
+++ b/jv.c
@@ -627,7 +627,7 @@ jv jv_string_indexes(jv j, jv k) {
   jv a = jv_array();
 
   p = jstr;
-  while ((p = jq_memmem(p, (jstr + jlen) - p, idxstr, idxlen)) != NULL) {
+  while ((p = _jq_memmem(p, (jstr + jlen) - p, idxstr, idxlen)) != NULL) {
     a = jv_array_append(a, jv_number(p - jstr));
     p += idxlen;
   }
@@ -649,7 +649,7 @@ jv jv_string_split(jv j, jv sep) {
   assert(jv_get_refcnt(a) == 1);
 
   for (p = jstr; p < jstr + jlen; p = s + seplen) {
-    s = jq_memmem(p, (jstr + jlen) - p, sepstr, seplen);
+    s = _jq_memmem(p, (jstr + jlen) - p, sepstr, seplen);
     if (s == NULL)
       s = jstr + jlen;
     a = jv_array_append(a, jv_string_sized(p, s - p));
diff --git a/util.c b/util.c
index da0b40c4..08ec715c 100644
--- a/util.c
+++ b/util.c
@@ -92,8 +92,8 @@ jv jq_realpath(jv path) {
   return path;
 }
 
-const void *jq_memmem(const void *haystack, size_t haystacklen,
-                      const void *needle, size_t needlelen) {
+const void *_jq_memmem(const void *haystack, size_t haystacklen,
+                       const void *needle, size_t needlelen) {
 #ifdef HAVE_MEMMEM
   return (const void*)memmem(haystack, haystacklen, needle, needlelen);
 #else
diff --git a/util.h b/util.h
index f2df3909..6e3cb9f0 100644
--- a/util.h
+++ b/util.h
@@ -7,8 +7,8 @@ jv expand_path(jv);
 jv get_home(void);
 jv jq_realpath(jv);
 
-const void *jq_memmem(const void *haystack, size_t haystacklen,
-                      const void *needle, size_t needlelen);
+const void *_jq_memmem(const void *haystack, size_t haystacklen,
+                       const void *needle, size_t needlelen);
 
 #ifndef MIN
 #define MIN(a,b) \