diff --git a/libsepol/include/sepol/policydb/polcaps.h b/libsepol/include/sepol/policydb/polcaps.h
index c9e40f62..623818ab 100644
--- a/libsepol/include/sepol/policydb/polcaps.h
+++ b/libsepol/include/sepol/policydb/polcaps.h
@@ -19,7 +19,7 @@ enum {
 extern int sepol_polcap_getnum(const char *name);
 
 /* Convert a capability number to name. */
-extern const char *sepol_polcap_getname(int capnum);
+extern const char *sepol_polcap_getname(unsigned int capnum);
 
 #ifdef __cplusplus
 }
diff --git a/libsepol/src/polcaps.c b/libsepol/src/polcaps.c
index 3924cb83..248d2f52 100644
--- a/libsepol/src/polcaps.c
+++ b/libsepol/src/polcaps.c
@@ -26,7 +26,7 @@ int sepol_polcap_getnum(const char *name)
 	return -1;
 }
 
-const char *sepol_polcap_getname(int capnum)
+const char *sepol_polcap_getname(unsigned int capnum)
 {
 	if (capnum > POLICYDB_CAPABILITY_MAX)
 		return NULL;