diff --git a/tools/alsa_in.c b/tools/alsa_in.c
index ba29764..dbf3563 100644
--- a/tools/alsa_in.c
+++ b/tools/alsa_in.c
@@ -183,7 +183,7 @@ static int set_hwparams(snd_pcm_t *handle, snd_pcm_hw_params_t *params, snd_pcm_
 	}
 	/* set the buffer time */
 
-	buffer_time = 1000000*period*nperiods/rate;
+	buffer_time = 1000000*(uint64_t)period*nperiods/rate;
 	err = snd_pcm_hw_params_set_buffer_time_near(handle, params, &buffer_time, &dir);
 	if (err < 0) {
 		printf("Unable to set buffer time %i for playback: %s\n",  1000000*period*nperiods/rate, snd_strerror(err));
@@ -198,7 +198,7 @@ static int set_hwparams(snd_pcm_t *handle, snd_pcm_hw_params_t *params, snd_pcm_
 	    printf( "WARNING: buffer size does not match: (requested %d, got %d)\n", nperiods * period, (int) real_buffer_size );
 	}
 	/* set the period time */
-	period_time = 1000000*period/rate;
+	period_time = 1000000*(uint64_t)period/rate;
 	err = snd_pcm_hw_params_set_period_time_near(handle, params, &period_time, &dir);
 	if (err < 0) {
 		printf("Unable to set period time %i for playback: %s\n", 1000000*period/rate, snd_strerror(err));
diff --git a/tools/alsa_out.c b/tools/alsa_out.c
index 6d7e097..abfd431 100644
--- a/tools/alsa_out.c
+++ b/tools/alsa_out.c
@@ -182,7 +182,7 @@ static int set_hwparams(snd_pcm_t *handle, snd_pcm_hw_params_t *params, snd_pcm_
 	}
 	/* set the buffer time */
 
-	buffer_time = 1000000*period*nperiods/rate;
+	buffer_time = 1000000*(uint64_t)period*nperiods/rate;
 	err = snd_pcm_hw_params_set_buffer_time_near(handle, params, &buffer_time, &dir);
 	if (err < 0) {
 		printf("Unable to set buffer time %i for playback: %s\n",  1000000*period*nperiods/rate, snd_strerror(err));
@@ -197,7 +197,7 @@ static int set_hwparams(snd_pcm_t *handle, snd_pcm_hw_params_t *params, snd_pcm_
 	    printf( "WARNING: buffer size does not match: (requested %d, got %d)\n", nperiods * period, (int) real_buffer_size );
 	}
 	/* set the period time */
-	period_time = 1000000*period/rate;
+	period_time = 1000000*(uint64_t)period/rate;
 	err = snd_pcm_hw_params_set_period_time_near(handle, params, &period_time, &dir);
 	if (err < 0) {
 		printf("Unable to set period time %i for playback: %s\n", 1000000*period/rate, snd_strerror(err));