diff --git a/configure.ac b/configure.ac
index 4b5ab662..1838e50b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -516,6 +516,13 @@ if test -z "$gcc_have_atomics"; then
 fi
 AC_MSG_RESULT($gcc_have_atomics)
 
+dnl check mmx register for pcm_dmix_i386
+
+AC_TRY_LINK([],
+    [__asm__ volatile ("" : : : "mm0");],
+    [AC_DEFINE([HAVE_MMX], "1", [MMX technology is enabled])],
+    [])
+
 PCM_PLUGIN_LIST="copy linear route mulaw alaw adpcm rate plug multi shm file null empty share meter hooks lfloat ladspa dmix dshare dsnoop asym iec958 softvol extplug ioplug mmap_emul"
 
 build_pcm_plugin="no"
diff --git a/src/pcm/pcm_dmix_i386.h b/src/pcm/pcm_dmix_i386.h
index 3ea0737d..5c900bf1 100644
--- a/src/pcm/pcm_dmix_i386.h
+++ b/src/pcm/pcm_dmix_i386.h
@@ -237,6 +237,12 @@ static void MIX_AREAS_16_MMX(unsigned int size,
 		  [dst_step] "m" (dst_step),  [src_step] "m" (src_step),
 		  [sum_step] "m" (sum_step)
 		: "esi", "edi", "edx", "ecx", "eax", "memory", "cc"
+#ifdef HAVE_MMX
+		  , "mm0"
+#else
+		  , "st", "st(1)", "st(2)", "st(3)",
+		  "st(4)", "st(5)", "st(6)", "st(7)"
+#endif
 	);
 }
 
diff --git a/src/pcm/pcm_dmix_x86_64.h b/src/pcm/pcm_dmix_x86_64.h
index 7f711547..803d3b24 100644
--- a/src/pcm/pcm_dmix_x86_64.h
+++ b/src/pcm/pcm_dmix_x86_64.h
@@ -119,6 +119,12 @@ static void MIX_AREAS_16(unsigned int size,
 		  [dst_step] "m" (dst_step),  [src_step] "m" (src_step),
 		  [sum_step] "m" (sum_step)
 		: "rsi", "rdi", "edx", "ecx", "eax", "memory", "cc"
+#ifdef HAVE_MMX
+		  , "mm0"
+#else
+		  , "st", "st(1)", "st(2)", "st(3)",
+		  "st(4)", "st(5)", "st(6)", "st(7)"
+#endif
 	);
 }