diff --git a/src/libnm-glib-aux/nm-shared-utils.c b/src/libnm-glib-aux/nm-shared-utils.c
index 5f0e515a43..db730b28a8 100644
--- a/src/libnm-glib-aux/nm-shared-utils.c
+++ b/src/libnm-glib-aux/nm-shared-utils.c
@@ -32,8 +32,8 @@ G_STATIC_ASSERT(G_STRUCT_OFFSET(NMUtilsNamedValue, value_ptr) == sizeof(const ch
 
 /*****************************************************************************/
 
-const char _nm_hexchar_table_lower[16] = "0123456789abcdef";
-const char _nm_hexchar_table_upper[16] = "0123456789ABCDEF";
+const char _nm_hexchar_table_lower[] = "0123456789abcdef";
+const char _nm_hexchar_table_upper[] = "0123456789ABCDEF";
 
 const void *const _NM_PTRARRAY_EMPTY[1] = {NULL};
 
diff --git a/src/libnm-glib-aux/nm-shared-utils.h b/src/libnm-glib-aux/nm-shared-utils.h
index 754c21aec9..4fa538e2da 100644
--- a/src/libnm-glib-aux/nm-shared-utils.h
+++ b/src/libnm-glib-aux/nm-shared-utils.h
@@ -2640,8 +2640,8 @@ int nm_utils_getpagesize(void);
 
 /*****************************************************************************/
 
-extern const char _nm_hexchar_table_lower[16];
-extern const char _nm_hexchar_table_upper[16];
+extern const char _nm_hexchar_table_lower[];
+extern const char _nm_hexchar_table_upper[];
 
 static inline char
 nm_hexchar(int x, gboolean upper_case)