diff --git a/rdrand.cpp b/rdrand.cpp
index d18f3bd0..f3b586a9 100644
--- a/rdrand.cpp
+++ b/rdrand.cpp
@@ -7,10 +7,6 @@
 #include "rdrand.h"
 #include "cpu.h"
 
-#if CRYPTOPP_MSC_VERSION
-# pragma warning(disable: 4100)
-#endif
-
 // This file (and friends) provides both RDRAND and RDSEED. They were added at
 //   Crypto++ 5.6.3. At compile time, it uses CRYPTOPP_BOOL_{X86|X32|X64}
 //   to select an implementation or "throw NotImplemented". The class does not
@@ -158,6 +154,7 @@ inline void RDRAND32(void* output)
     while(!_rdrand32_step(reinterpret_cast<word32*>(output))) {}
 #else
     // RDRAND not detected at compile time, or no suitable compiler found
+	CRYPTOPP_UNUSED(output);
     throw NotImplemented("RDRAND: failed to find an implementation");
 #endif
 }
@@ -199,6 +196,7 @@ inline void RDRAND64(void* output)
     while(!_rdrand64_step(reinterpret_cast<unsigned long long*>(output))) {}
 #else
     // RDRAND not detected at compile time, or no suitable compiler found
+	CRYPTOPP_UNUSED(output);
     throw NotImplemented("RDRAND: failed to find an implementation");
 #endif
 }
@@ -253,6 +251,7 @@ void RDRAND::GenerateBlock(byte *output, size_t size)
     }
 #else
     // RDRAND not detected at compile time, or no suitable compiler found
+	CRYPTOPP_UNUSED(output);
     throw NotImplemented("RDRAND: failed to find a suitable implementation");
 #endif
 }
@@ -312,6 +311,7 @@ inline void RDSEED32(void* output)
     while(!_rdseed32_step(reinterpret_cast<word32*>(output))) {}
 #else
     // RDSEED not detected at compile time, or no suitable compiler found
+	CRYPTOPP_UNUSED(output);
     throw NotImplemented("RDSEED: failed to find an implementation");
 #endif
 }
@@ -353,6 +353,7 @@ inline void RDSEED64(void* output)
     while(!_rdseed64_step(reinterpret_cast<unsigned long long*>(output))) {}
 #else
     // RDSEED not detected at compile time, or no suitable compiler found
+	CRYPTOPP_UNUSED(output);
     throw NotImplemented("RDSEED: failed to find an implementation");
 #endif
 }