diff --git a/lib/krb5/store_emem.c b/lib/krb5/store_emem.c
index 34e029ba2..5e5f82963 100644
--- a/lib/krb5/store_emem.c
+++ b/lib/krb5/store_emem.c
@@ -47,7 +47,7 @@ typedef struct emem_storage{
     unsigned char *ptr;
 }emem_storage;
 
-static size_t
+static ssize_t
 emem_fetch(krb5_storage *sp, void *data, size_t size)
 {
     emem_storage *s = (emem_storage*)sp->data;
@@ -58,7 +58,7 @@ emem_fetch(krb5_storage *sp, void *data, size_t size)
     return size;
 }
 
-static size_t
+static ssize_t
 emem_store(krb5_storage *sp, void *data, size_t size)
 {
     emem_storage *s = (emem_storage*)sp->data;
diff --git a/lib/krb5/store_fd.c b/lib/krb5/store_fd.c
index 8b67a806f..c308a6ee6 100644
--- a/lib/krb5/store_fd.c
+++ b/lib/krb5/store_fd.c
@@ -46,13 +46,13 @@ typedef struct fd_storage{
 
 #define FD(S) (((fd_storage*)(S)->data)->fd)
 
-static size_t
+static ssize_t
 fd_fetch(krb5_storage *sp, void *data, size_t size)
 {
     return read(FD(sp), data, size);
 }
 
-static size_t
+static ssize_t
 fd_store(krb5_storage *sp, void *data, size_t size)
 {
     return write(FD(sp), data, size);
diff --git a/lib/krb5/store_mem.c b/lib/krb5/store_mem.c
index 7b7f14d61..dd4a56f66 100644
--- a/lib/krb5/store_mem.c
+++ b/lib/krb5/store_mem.c
@@ -46,7 +46,7 @@ typedef struct mem_storage{
     unsigned char *ptr;
 }mem_storage;
 
-static size_t
+static ssize_t
 mem_fetch(krb5_storage *sp, void *data, size_t size)
 {
     mem_storage *s = (mem_storage*)sp->data;
@@ -57,7 +57,7 @@ mem_fetch(krb5_storage *sp, void *data, size_t size)
     return size;
 }
 
-static size_t
+static ssize_t
 mem_store(krb5_storage *sp, void *data, size_t size)
 {
     mem_storage *s = (mem_storage*)sp->data;