diff --git a/prov/util/src/util_mem_hooks.c b/prov/util/src/util_mem_hooks.c
index ce69e64fc27..5dc49f8c917 100644
--- a/prov/util/src/util_mem_hooks.c
+++ b/prov/util/src/util_mem_hooks.c
@@ -220,8 +220,8 @@ static inline int ofi_write_patch(unsigned char *patch_data, void *address,
 	}
 
 	base = ofi_get_page_start(address, page_size);
-	bound = ofi_get_page_end(address, page_size);
-	length = (uintptr_t) bound - (uintptr_t) base;
+	bound = ofi_get_page_end(address + data_size, page_size);
+	length = (uintptr_t) bound - (uintptr_t) base + 1;
 
 	if (mprotect(base, length, PROT_EXEC|PROT_READ|PROT_WRITE)) {
 		FI_WARN(&core_prov, FI_LOG_MR,