diff --git a/blktemplate.c b/blktemplate.c
index cefa928..d19f575 100644
--- a/blktemplate.c
+++ b/blktemplate.c
@@ -49,10 +49,10 @@ const char *blktmpl_capabilityname(gbt_capabilities_t caps) {
 	return NULL;
 }
 
-gbt_capabilities_t blktmpl_getcapability(const char *n) {
+uint32_t blktmpl_getcapability(const char *n) {
 	for (unsigned int i = 0; i < GBT_CAPABILITY_COUNT; ++i)
 		if (capnames[i] && !strcasecmp(n, capnames[i]))
-			return 1 << i;
+			return ((uint32_t)1) << i;
 	if (!strcasecmp(n, "time")) {
 		// multi-capability
 		return BMM_TIMEINC | BMM_TIMEDEC;
diff --git a/blktemplate.h b/blktemplate.h
index ee90eca..624ad62 100644
--- a/blktemplate.h
+++ b/blktemplate.h
@@ -89,8 +89,8 @@ typedef enum {
 
 extern const char *blktmpl_capabilityname(gbt_capabilities_t);
 #define BLKTMPL_LONGEST_CAPABILITY_NAME  (16)
-// ABI FIXME: return uint32_t since "time" can yield a combination gbt_capabilities_t
-extern gbt_capabilities_t blktmpl_getcapability(const char *);
+// NOTE: blktmpl_getcapability("time") yields a combination of gbt_capabilities_t
+extern uint32_t blktmpl_getcapability(const char *);
 
 
 typedef gbt_capabilities_t blkmutations_t;