diff --git a/README.md b/README.md
index be13d7b2..881496f4 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ For those situations where one must quckly compose a temporary string using `spr
 if (dwMaxSendPacketSize < sizeof(EapPacket))
     throw std::invalid_argument(
         winstd::string_printf(
-            "Maximum packet size too small (minimum: %zu, available: %u).",
+            "Maximum packet size too small (minimum: %zu, available: %u)",
             sizeof(EapPacket) + 1,
             dwMaxSendPacketSize));
 ```
diff --git a/include/WinStd/COM.h b/include/WinStd/COM.h
index 38ba6542..fc8e07e9 100644
--- a/include/WinStd/COM.h
+++ b/include/WinStd/COM.h
@@ -276,7 +276,7 @@ namespace winstd
             vt = VT_EMPTY;
             const HRESULT hr = VariantCopy(this, &varSrc);
             if (FAILED(hr))
-                throw winstd::com_runtime_error(hr, "VariantCopy failed.");
+                throw winstd::com_runtime_error(hr, "VariantCopy failed");
         }
 
         ///
@@ -472,7 +472,7 @@ namespace winstd
             LPSAFEARRAY pCopy;
             const HRESULT hr = SafeArrayCopy(const_cast<LPSAFEARRAY>(pSrc), &pCopy);
             if (FAILED(hr))
-                throw winstd::com_runtime_error(hr, "SafeArrayCopy failed.");
+                throw winstd::com_runtime_error(hr, "SafeArrayCopy failed");
 
             SafeArrayGetVartype(const_cast<LPSAFEARRAY>(pSrc), &vt);
             vt |= VT_ARRAY;
@@ -495,7 +495,7 @@ namespace winstd
             if (this != &varSrc) {
                 const HRESULT hr = VariantCopy(this, &varSrc);
                 if (FAILED(hr))
-                    throw winstd::com_runtime_error(hr, "VariantCopy failed.");
+                    throw winstd::com_runtime_error(hr, "VariantCopy failed");
             }
             return *this;
         }
diff --git a/include/WinStd/Crypt.h b/include/WinStd/Crypt.h
index 6ccdbbb6..8847062c 100644
--- a/include/WinStd/Crypt.h
+++ b/include/WinStd/Crypt.h
@@ -693,7 +693,7 @@ namespace winstd
             cbData = other.cbData;
             if (cbData) {
                 pbData = static_cast<BYTE*>(LocalAlloc(LMEM_FIXED, other.cbData));
-                if (!pbData) throw win_runtime_error("LocalAlloc failed.");
+                if (!pbData) throw win_runtime_error("LocalAlloc failed");
                 memcpy(pbData, other.pbData, other.cbData);
             } else
                 pbData = NULL;
@@ -730,7 +730,7 @@ namespace winstd
                     LocalFree(pbData);
                 if (cbData) {
                     pbData = static_cast<BYTE*>(LocalAlloc(LMEM_FIXED, other.cbData));
-                    if (!pbData) throw win_runtime_error("LocalAlloc failed.");
+                    if (!pbData) throw win_runtime_error("LocalAlloc failed");
                     memcpy(pbData, other.pbData, other.cbData);
                 } else
                     pbData = NULL;
diff --git a/include/WinStd/WinTrust.h b/include/WinStd/WinTrust.h
index 0c203f23..4baa4e38 100644
--- a/include/WinStd/WinTrust.h
+++ b/include/WinStd/WinTrust.h
@@ -35,7 +35,7 @@ namespace winstd
         {
             const LONG lResult = WinVerifyTrust(m_hwnd, &m_action, &m_wtd);
             if (lResult != ERROR_SUCCESS)
-                throw win_runtime_error(lResult, "WinVerifyTrust failed.");
+                throw win_runtime_error(lResult, "WinVerifyTrust failed");
         }
 
         ///