diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 64b64fb242d..78387ff010a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2020-01-13  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* regformats/regdat.sh: Generate declaration for init function.
+
 2020-01-13  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* remote-sim.c (next_pid, INITIAL_PID, sim_inferior_data): Move
diff --git a/gdb/regformats/regdat.sh b/gdb/regformats/regdat.sh
index 1839a881213..a40f2336484 100755
--- a/gdb/regformats/regdat.sh
+++ b/gdb/regformats/regdat.sh
@@ -127,6 +127,10 @@ do
 
     echo "const struct target_desc *tdesc_${name};"
     echo ""
+
+    # This is necessary for -Wmissing-declarations.
+    echo "void init_registers_${name} (void);"
+
     echo "void"
     echo "init_registers_${name} (void)"
     echo "{"