diff --git a/src/minisketch/configure.ac b/src/minisketch/configure.ac
index 9dc66e7fd2f..83910448a2c 100644
--- a/src/minisketch/configure.ac
+++ b/src/minisketch/configure.ac
@@ -124,9 +124,6 @@ if test "x$use_ccache" != "xno"; then
   fi
   AC_MSG_RESULT($use_ccache)
 fi
-if test "x$use_ccache" = "xyes"; then
-    AX_CHECK_COMPILE_FLAG([-Qunused-arguments],[NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Qunused-arguments"],,[[$CXXFLAG_WERROR]])
-fi
 
 VERIFY_DEFINES=-DMINISKETCH_VERIFY
 RELEASE_DEFINES=
diff --git a/src/minisketch/src/bench.cpp b/src/minisketch/src/bench.cpp
index f55944a448a..dc44379fdb5 100644
--- a/src/minisketch/src/bench.cpp
+++ b/src/minisketch/src/bench.cpp
@@ -62,13 +62,11 @@ int main(int argc, char** argv) {
             if (!states[0]) {
                 printf("         -\t");
             } else {
-                double total = 0.0;
                 for (auto& state : states) {
                     auto start = std::chrono::steady_clock::now();
                     minisketch_decode(state, 2 * syndromes, roots.data());
                     auto stop = std::chrono::steady_clock::now();
                     std::chrono::duration<double> dur(stop - start);
-                    total += dur.count();
                     benches.push_back(dur.count());
                 }
                 std::sort(benches.begin(), benches.end());
@@ -98,7 +96,6 @@ int main(int argc, char** argv) {
             if (!states[0]) {
                 printf("         -\t");
             } else {
-                double total = 0.0;
                 for (auto& state : states) {
                     auto start = std::chrono::steady_clock::now();
                     for (auto val : data) {
@@ -106,7 +103,6 @@ int main(int argc, char** argv) {
                     }
                     auto stop = std::chrono::steady_clock::now();
                     std::chrono::duration<double> dur(stop - start);
-                    total += dur.count();
                     benches.push_back(dur.count());
                 }
                 std::sort(benches.begin(), benches.end());
diff --git a/src/minisketch/src/int_utils.h b/src/minisketch/src/int_utils.h
index 62b2c38a294..d21ba56f336 100644
--- a/src/minisketch/src/int_utils.h
+++ b/src/minisketch/src/int_utils.h
@@ -129,17 +129,7 @@ constexpr inline I Mask() { return ((I((I(-1)) << (std::numeric_limits<I>::digit
 /** Compute the smallest power of two that is larger than val. */
 template<typename I>
 static inline int CountBits(I val, int max) {
-#ifdef HAVE_CLZ
-    (void)max;
-    if (val == 0) return 0;
-    if (std::numeric_limits<unsigned>::digits >= std::numeric_limits<I>::digits) {
-        return std::numeric_limits<unsigned>::digits - __builtin_clz(val);
-    } else if (std::numeric_limits<unsigned long>::digits >= std::numeric_limits<I>::digits) {
-        return std::numeric_limits<unsigned long>::digits - __builtin_clzl(val);
-    } else {
-        return std::numeric_limits<unsigned long long>::digits - __builtin_clzll(val);
-    }
-#elif _MSC_VER
+#ifdef _MSC_VER
     (void)max;
     unsigned long index;
     unsigned char ret;
@@ -149,7 +139,17 @@ static inline int CountBits(I val, int max) {
         ret = _BitScanReverse64(&index, val);
     }
     if (!ret) return 0;
-    return index;
+    return index + 1;
+#elif HAVE_CLZ
+    (void)max;
+    if (val == 0) return 0;
+    if (std::numeric_limits<unsigned>::digits >= std::numeric_limits<I>::digits) {
+        return std::numeric_limits<unsigned>::digits - __builtin_clz(val);
+    } else if (std::numeric_limits<unsigned long>::digits >= std::numeric_limits<I>::digits) {
+        return std::numeric_limits<unsigned long>::digits - __builtin_clzl(val);
+    } else {
+        return std::numeric_limits<unsigned long long>::digits - __builtin_clzll(val);
+    }
 #else
     while (max && (val >> (max - 1) == 0)) --max;
     return max;
diff --git a/src/minisketch/src/test.cpp b/src/minisketch/src/test.cpp
index 417937ea5f6..85b9e9e3967 100644
--- a/src/minisketch/src/test.cpp
+++ b/src/minisketch/src/test.cpp
@@ -9,6 +9,7 @@
 #include <limits>
 #include <random>
 #include <stdexcept>
+#include <string>
 #include <vector>
 
 #include "../include/minisketch.h"