diff --git a/inc/vmapi/hf/call.h b/inc/vmapi/hf/call.h
index 7f229d2..7b523e2 100644
--- a/inc/vmapi/hf/call.h
+++ b/inc/vmapi/hf/call.h
@@ -131,7 +131,7 @@
  *
  * Returns 0 on success, or -1 if the intid is invalid.
  */
-static inline uint64_t hf_enable_interrupt(uint32_t intid, bool enable)
+static inline int64_t hf_enable_interrupt(uint32_t intid, bool enable)
 {
 	return hf_call(HF_ENABLE_INTERRUPT, intid, enable, 0);
 }
diff --git a/src/api.c b/src/api.c
index b43c24f..1cba24f 100644
--- a/src/api.c
+++ b/src/api.c
@@ -542,7 +542,7 @@
 }
 
 /**
- * Return wheher the current vCPU is allowed to inject an interrupt into the
+ * Returns whether the current vCPU is allowed to inject an interrupt into the
  * given VM and vCPU.
  */
 static inline bool is_injection_allowed(uint32_t target_vm_id,