diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index db44899bc57b60a5877ea7f1ce4784cb51ce4ed4..917badb9a073dddb0bab72b791ee016b72dd9274 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -229,9 +229,11 @@ OBJS-$(CONFIG_FRAPS_DECODER)           += fraps.o
 OBJS-$(CONFIG_FRWU_DECODER)            += frwu.o
 OBJS-$(CONFIG_G2M_DECODER)             += g2meet.o elsdec.o
 OBJS-$(CONFIG_G723_1_DECODER)          += g723_1dec.o g723_1.o \
-                                          acelp_vectors.o celp_filters.o
+                                          acelp_vectors.o celp_filters.o \
+                                          celp_math.o
 OBJS-$(CONFIG_G723_1_ENCODER)          += g723_1enc.o g723_1.o \
-                                          acelp_vectors.o celp_filters.o
+                                          acelp_vectors.o celp_filters.o \
+                                          celp_math.o
 OBJS-$(CONFIG_GIF_DECODER)             += gifdec.o lzw.o
 OBJS-$(CONFIG_GIF_ENCODER)             += gif.o lzwenc.o
 OBJS-$(CONFIG_GSM_DECODER)             += gsmdec.o gsmdec_data.o msgsmdec.o