diff --git a/src/core/misc.c b/src/core/misc.c
index b97d2fa6..9f9c9179 100644
--- a/src/core/misc.c
+++ b/src/core/misc.c
@@ -308,7 +308,7 @@ char *stristr(const char *data, const char *key)
 	((unsigned char) (c) < 128 && \
 	(i_isspace(c) || i_ispunct(c)))
 
-char *strstr_full_case(const char *data, const char *key, int icase)
+static char *strstr_full_case(const char *data, const char *key, int icase)
 {
 	const char *start, *max;
 	int keylen, datalen, pos, match;
diff --git a/src/core/misc.h b/src/core/misc.h
index a7c07322..22914bdb 100644
--- a/src/core/misc.h
+++ b/src/core/misc.h
@@ -85,9 +85,7 @@ int strocpy(char *dest, const char *src, size_t dstsize);
 /* strstr() with case-ignoring */
 char *stristr(const char *data, const char *key);
 
-/* like strstr(), but matches only for full words.
-   `icase' specifies if match is case sensitive */
-char *strstr_full_case(const char *data, const char *key, int icase);
+/* like strstr(), but matches only for full words. */
 char *strstr_full(const char *data, const char *key);
 char *stristr_full(const char *data, const char *key);