diff --git a/hwdriver.c b/hwdriver.c
index 5e9cb02f..11039016 100644
--- a/hwdriver.c
+++ b/hwdriver.c
@@ -41,7 +41,7 @@ SR_API struct sr_hwcap_option sr_hwcap_options[] = {
 	{SR_HWCAP_HORIZ_TRIGGERPOS, SR_T_FLOAT, "Horizontal trigger position",
 			"horiz_triggerpos"},
 	{SR_HWCAP_BUFFERSIZE, SR_T_UINT64, "Buffer size", "buffersize"},
-	{SR_HWCAP_TIMEBASE, SR_T_RATIONAL, "Time base", "timebase"},
+	{SR_HWCAP_TIMEBASE, SR_T_RATIONAL_PERIOD, "Time base", "timebase"},
 	{SR_HWCAP_FILTER, SR_T_CHAR, "Filter targets", "filter"},
 	{0, 0, NULL, NULL},
 };
diff --git a/sigrok.h.in b/sigrok.h.in
index 7da26b2f..8ff1b092 100644
--- a/sigrok.h.in
+++ b/sigrok.h.in
@@ -143,7 +143,7 @@ enum {
 	SR_T_CHAR,
 	SR_T_BOOL,
 	SR_T_FLOAT,
-	SR_T_RATIONAL,
+	SR_T_RATIONAL_PERIOD,
 };
 
 struct sr_rational {