diff --git a/src/info.c b/src/info.c
index f6449fe8..42e8b2f8 100644
--- a/src/info.c
+++ b/src/info.c
@@ -44,7 +44,7 @@ int get_revision() {
    }
 }
 
-int get_clock_rate(int clk_id) {
+unsigned int get_clock_rate(int clk_id) {
    rpi_mailbox_property_t *buf;
    RPI_PropertyInit();
    RPI_PropertyAddTag(TAG_GET_CLOCK_RATE, clk_id);
diff --git a/src/info.h b/src/info.h
index 102a8edc..0fb9b3a6 100644
--- a/src/info.h
+++ b/src/info.h
@@ -21,7 +21,7 @@ extern int get_speed();
 /* Cached on boot, so this is safe to call at any time */
 extern char *get_info_string();
 
-extern int get_clock_rate(int clk_id);
+extern unsigned int get_clock_rate(int clk_id);
 extern void set_clock_rates(unsigned int cpu, unsigned int core, unsigned int sdram);
 
 int get_revision();