diff --git a/src/engine/platform/mmc5.cpp b/src/engine/platform/mmc5.cpp
index be81c2791..672891bb4 100644
--- a/src/engine/platform/mmc5.cpp
+++ b/src/engine/platform/mmc5.cpp
@@ -69,7 +69,7 @@ void DivPlatformMMC5::acquireDirect(blip_buffer_t** bb, size_t len) {
       break;
     } else {
       pcmAdvance=len-i;
-      if (dacPeriod>0) {
+      if (dacRate>0) {
         int remainTime=(rate-dacPeriod+dacRate-1)/dacRate;
         if (remainTime<pcmAdvance) pcmAdvance=remainTime;
         if (remainTime<1) pcmAdvance=1;
diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index 8fec7e762..37d5c19db 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -122,7 +122,7 @@ void DivPlatformNES::acquire_puNES(blip_buffer_t** bb, size_t len) {
         break;
       } else {
         pcmAdvance=len-i;
-        if (dacPeriod>0) {
+        if (dacRate>0) {
           int remainTime=(rate-dacPeriod+dacRate-1)/dacRate;
           if (remainTime<pcmAdvance) pcmAdvance=remainTime;
           if (remainTime<1) pcmAdvance=1;