diff --git a/configure b/configure
index 58610bf45c..4d308d2abd 100755
--- a/configure
+++ b/configure
@@ -899,6 +899,7 @@ COMPONENT_LIST="
 CONFIG_LIST="
     $COMPONENT_LIST
     aandct
+    ac3dsp
     avcodec
     avdevice
     avfilter
@@ -1237,7 +1238,8 @@ aac_decoder_select="mdct rdft"
 aac_encoder_select="mdct"
 aac_latm_decoder_select="aac_decoder aac_latm_parser"
 ac3_decoder_select="mdct ac3_parser"
-ac3_encoder_select="mdct"
+ac3_encoder_select="mdct ac3dsp"
+ac3_fixed_encoder_select="ac3dsp"
 alac_encoder_select="lpc"
 amrnb_decoder_select="lsp"
 amrwb_decoder_select="lsp"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 930affbb7a..e116a7d01c 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -26,6 +26,7 @@ OBJS = allcodecs.o                                                      \
 
 # parts needed for many different codecs
 OBJS-$(CONFIG_AANDCT)                  += aandcttab.o
+OBJS-$(CONFIG_AC3DSP)                  += ac3dsp.o
 OBJS-$(CONFIG_ENCODERS)                += faandct.o jfdctfst.o jfdctint.o
 OBJS-$(CONFIG_DCT)                     += dct.o
 OBJS-$(CONFIG_DWT)                     += dwt.o
@@ -55,10 +56,8 @@ OBJS-$(CONFIG_AAC_ENCODER)             += aacenc.o aaccoder.o    \
                                           mpeg4audio.o
 OBJS-$(CONFIG_AASC_DECODER)            += aasc.o msrledec.o
 OBJS-$(CONFIG_AC3_DECODER)             += ac3dec.o ac3dec_data.o ac3.o
-OBJS-$(CONFIG_AC3_ENCODER)             += ac3enc_float.o ac3tab.o ac3.o \
-                                          ac3dsp.o
-OBJS-$(CONFIG_AC3_FIXED_ENCODER)       += ac3enc_fixed.o ac3tab.o ac3.o \
-                                          ac3dsp.o
+OBJS-$(CONFIG_AC3_ENCODER)             += ac3enc_float.o ac3tab.o ac3.o
+OBJS-$(CONFIG_AC3_FIXED_ENCODER)       += ac3enc_fixed.o ac3tab.o ac3.o
 OBJS-$(CONFIG_ALAC_DECODER)            += alac.o
 OBJS-$(CONFIG_ALAC_ENCODER)            += alacenc.o
 OBJS-$(CONFIG_ALS_DECODER)             += alsdec.o bgmc.o mpeg4audio.o
diff --git a/libavcodec/x86/Makefile b/libavcodec/x86/Makefile
index 1b58fa121f..f8d456d3ea 100644
--- a/libavcodec/x86/Makefile
+++ b/libavcodec/x86/Makefile
@@ -17,10 +17,8 @@ MMX-OBJS-$(CONFIG_H264PRED)            += x86/h264_intrapred_init.o
 
 YASM-OBJS-$(CONFIG_VC1_DECODER)        += x86/vc1dsp_yasm.o
 
-MMX-OBJS-$(CONFIG_AC3_ENCODER)         += x86/ac3dsp_mmx.o
-MMX-OBJS-$(CONFIG_AC3_FIXED_ENCODER)   += x86/ac3dsp_mmx.o
-YASM-OBJS-$(CONFIG_AC3_ENCODER)        += x86/ac3dsp.o
-YASM-OBJS-$(CONFIG_AC3_FIXED_ENCODER)  += x86/ac3dsp.o
+MMX-OBJS-$(CONFIG_AC3DSP)              += x86/ac3dsp_mmx.o
+YASM-OBJS-$(CONFIG_AC3DSP)             += x86/ac3dsp.o
 MMX-OBJS-$(CONFIG_CAVS_DECODER)        += x86/cavsdsp_mmx.o
 MMX-OBJS-$(CONFIG_MP1FLOAT_DECODER)    += x86/mpegaudiodec_mmx.o
 MMX-OBJS-$(CONFIG_MP2FLOAT_DECODER)    += x86/mpegaudiodec_mmx.o