diff --git a/src/dev_arygon.c b/src/dev_arygon.c
index adfe04c..f01ba91 100644
--- a/src/dev_arygon.c
+++ b/src/dev_arygon.c
@@ -137,10 +137,18 @@ bool dev_arygon_transceive(const dev_spec ds, const byte_t* pbtTx, const uint32_
   }
 
   /** @note ARYGON-APDB need 20ms between sending and receiving frame. No information regarding this in ARYGON datasheet... */
-  usleep(20000);
+  #ifdef _WIN32
+    Sleep(20);
+  #else
+    usleep(20000);
+  #endif
 
   /** @note ARYGON-APDB need 20ms more to be able to report (correctly) present tag. */
-  usleep(20000);
+  #ifdef _WIN32
+    Sleep(20);
+  #else
+    usleep(20000);
+  #endif
 
   if (!rs232_receive((serial_port)ds,abtRxBuf,&uiRxBufLen)) {
     ERR("Unable to receive data. (RX)");
diff --git a/src/libnfc.c b/src/libnfc.c
index 5237382..5fd0eca 100644
--- a/src/libnfc.c
+++ b/src/libnfc.c
@@ -389,12 +389,13 @@ bool nfc_initiator_init(const dev_info* pdi)
 
 bool nfc_initiator_select_dep_target(const dev_info* pdi, const init_modulation im, const byte_t* pbtPidData, const uint32_t uiPidDataLen, const byte_t* pbtNFCID3i, const uint32_t uiNFCID3iDataLen, const byte_t *pbtGbData, const uint32_t uiGbDataLen, tag_info* pti)
 {
+  uint32_t offset;
   if(im == IM_ACTIVE_DEP) {
     pncmd_reader_jump_for_dep[2] = 0x01; /* active DEP */
   }
   pncmd_reader_jump_for_dep[3] = 0x00; /* baud rate = 106kbps */
 
-  uint32_t offset = 5;
+  offset = 5;
   if(pbtPidData && im != IM_ACTIVE_DEP) { /* can't have passive initiator data when using active mode */
     pncmd_reader_jump_for_dep[4] |= 0x01;
     memcpy(pncmd_reader_jump_for_dep+offset,pbtPidData,uiPidDataLen);