diff --git a/include/pinproc.h b/include/pinproc.h
index 5daec12..fbbf097 100644
--- a/include/pinproc.h
+++ b/include/pinproc.h
@@ -39,7 +39,9 @@
     #if defined(PR_BUILDING_PR)
         #define PR_EXPORT __declspec(dllexport) extern
     #else
-        #define PR_EXPORT __declspec(dllimport) extern
+        // TODO: Decide what to do here:
+        //#define PR_EXPORT __declspec(dllimport) extern
+        #define PR_EXPORT
     #endif
 #endif
 
diff --git a/src/PRDevice.cpp b/src/PRDevice.cpp
index 73e6191..5b1a230 100644
--- a/src/PRDevice.cpp
+++ b/src/PRDevice.cpp
@@ -525,7 +525,7 @@ PRResult PRDevice::SwitchGetStates( PREventType * switchStates, uint16_t numSwit
     // Wait for data to return.  Give it 10 loops before giving up.
     while (requestedDataQueue.size() < numWords && i++ < 10) 
     {
-        sleep (.01); // 10 milliseconds should be plenty of time.
+        PRSleep (10); // 10 milliseconds should be plenty of time.
         SortReturningData();
     }
 
@@ -677,7 +677,7 @@ PRResult PRDevice::VerifyChipID()
     max_count = 0;
     //std::cout << "Waiting for read data ";
     while (num_collected_bytes < (bufferWords*4) && max_count < 10) {
-        sleep(.01);
+        PRSleep(10);
         //std::cout << ". ";
         rc = CollectReadData();
         max_count++;
@@ -809,7 +809,7 @@ PRResult PRDevice::ReadDataRaw(uint32_t moduleSelect, uint32_t startingAddr, int
     // Expect numReadWords + 1 word with the address.
     while (requestedDataQueue.size() < (numReadWords + 1) && i++ < 10) 
     {
-        sleep (.01); // 10 milliseconds should be plenty of time.
+        PRSleep (10); // 10 milliseconds should be plenty of time.
         SortReturningData();
     }
 
diff --git a/src/PRHardware.h b/src/PRHardware.h
index bbcee7d..6329f20 100644
--- a/src/PRHardware.h
+++ b/src/PRHardware.h
@@ -29,6 +29,13 @@
 #include <stdint.h>
 #include "../include/pinproc.h"
 
+#if defined(__WIN32__)
+    #include <windows.h>
+    #define PRSleep(milliseconds) Sleep(milliseconds)
+#else
+    #define PRSleep(milliseconds) sleep(milliseconds/1000)
+#endif
+
 const int32_t FTDI_VENDOR_ID = 0x0403;
 const int32_t FTDI_FT245RL_PRODUCT_ID = 0x6001;
 
diff --git a/src/pinproc.cpp b/src/pinproc.cpp
index 593f81e..0c92ac6 100644
--- a/src/pinproc.cpp
+++ b/src/pinproc.cpp
@@ -31,6 +31,10 @@
 #include "../include/pinproc.h"
 #include "PRDevice.h"
 
+#if defined(__WIN32__)
+    #include <stardg.h>
+#endif
+
 #define MAX_TEXT (1024)
 
 typedef void (*PRLogCallback)(PRLogLevel level, const char *text);