diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index c022e16aa9..adbe1a3e55 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -84,11 +84,11 @@ OBJS-$(CONFIG_ALAC_DECODER)            += alac.o
 OBJS-$(CONFIG_ALAC_ENCODER)            += alacenc.o
 OBJS-$(CONFIG_ALS_DECODER)             += alsdec.o bgmc.o mpeg4audio.o
 OBJS-$(CONFIG_AMRNB_DECODER)           += amrnbdec.o celp_filters.o   \
-                                          acelp_filters.o             \
+                                          celp_math.o acelp_filters.o \
                                           acelp_vectors.o             \
                                           acelp_pitch_delay.o
 OBJS-$(CONFIG_AMRWB_DECODER)           += amrwbdec.o celp_filters.o   \
-                                          acelp_filters.o             \
+                                          celp_math.o acelp_filters.o \
                                           acelp_vectors.o             \
                                           acelp_pitch_delay.o
 OBJS-$(CONFIG_AMV_DECODER)             += sp5xdec.o mjpegdec.o mjpeg.o
@@ -332,7 +332,7 @@ OBJS-$(CONFIG_SGI_DECODER)             += sgidec.o
 OBJS-$(CONFIG_SGI_ENCODER)             += sgienc.o rle.o
 OBJS-$(CONFIG_SHORTEN_DECODER)         += shorten.o
 OBJS-$(CONFIG_SIPR_DECODER)            += sipr.o acelp_pitch_delay.o \
-                                          acelp_vectors.o \
+                                          celp_math.o acelp_vectors.o \
                                           acelp_filters.o celp_filters.o \
                                           sipr16k.o
 OBJS-$(CONFIG_SMACKAUD_DECODER)        += smacker.o
diff --git a/libavcodec/acelp_pitch_delay.c b/libavcodec/acelp_pitch_delay.c
index 1c8485047f..c091301474 100644
--- a/libavcodec/acelp_pitch_delay.c
+++ b/libavcodec/acelp_pitch_delay.c
@@ -25,6 +25,7 @@
 #include "avcodec.h"
 #include "dsputil.h"
 #include "acelp_pitch_delay.h"
+#include "celp_math.h"
 
 int ff_acelp_decode_8bit_to_1st_delay3(int ac_index)
 {