diff --git a/lib/libcompat.h b/lib/libcompat.h
index 9ec6eb81..e29c132c 100644
--- a/lib/libcompat.h
+++ b/lib/libcompat.h
@@ -234,12 +234,20 @@ CK_DLL_EXP int timer_delete(timer_t timerid);
 #include <stdarg.h>
 
 #if !HAVE_VSNPRINTF
-CK_DLL_EXP int rpl_vsnprintf(char *, size_t, const char *, va_list);
+CK_DLL_EXP int
+#if defined(__clang__)
+__attribute__((overloadable))
+#endif
+rpl_vsnprintf(char *, size_t, const char *, va_list);
 
 #define vsnprintf rpl_vsnprintf
 #endif
 #if !HAVE_SNPRINTF
-CK_DLL_EXP int rpl_snprintf(char *, size_t, const char *, ...);
+CK_DLL_EXP int
+#if defined(__clang__)
+__attribute__((overloadable))
+#endif
+rpl_snprintf(char *, size_t, const char *, ...);
 
 #define snprintf rpl_snprintf
 #endif
diff --git a/lib/snprintf.c b/lib/snprintf.c
index b91b65c6..280d6dc0 100644
--- a/lib/snprintf.c
+++ b/lib/snprintf.c
@@ -487,6 +487,9 @@ static LDOUBLE mypow10(int);
 extern int errno;
 
 int
+#if defined(__clang__)
+__attribute__((overloadable))
+#endif
 rpl_vsnprintf(char *str, size_t size, const char *format, va_list args)
 {
 	LDOUBLE fvalue;
@@ -1452,6 +1455,9 @@ mypow10(int exponent)
 #if !HAVE_SNPRINTF
 #if HAVE_STDARG_H
 int
+#if defined(__clang__)
+__attribute__((overloadable))
+#endif
 rpl_snprintf(char *str, size_t size, const char *format, ...)
 #else
 int