diff --git a/dll.vcxproj b/dll.vcxproj
index e808a124..c0743890 100644
--- a/dll.vcxproj
+++ b/dll.vcxproj
@@ -99,7 +99,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;%(PreprocessorDefinitions);MDBX_DEBUG=1</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;MDBX_AVOID_CRT;%(PreprocessorDefinitions);MDBX_DEBUG=1</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <WarningLevel>EnableAllWarnings</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
@@ -122,7 +122,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;MDBX_AVOID_CRT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <WarningLevel>EnableAllWarnings</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
@@ -162,7 +162,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
       <WarningLevel>EnableAllWarnings</WarningLevel>
-      <PreprocessorDefinitions>WIN64;_DEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;%(PreprocessorDefinitions);MDBX_DEBUG=1</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN64;_DEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;MDBX_AVOID_CRT;%(PreprocessorDefinitions);MDBX_DEBUG=1</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <StringPooling>true</StringPooling>
       <TreatWarningAsError>true</TreatWarningAsError>
@@ -179,7 +179,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
-      <PreprocessorDefinitions>WIN64;NDEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN64;NDEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;MDBX_BUILD_DLL;MDBX_AVOID_CRT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <StringPooling>true</StringPooling>
       <Optimization>Full</Optimization>
diff --git a/src/osal.c b/src/osal.c
index ef4c03ce..ee5b1f3f 100644
--- a/src/osal.c
+++ b/src/osal.c
@@ -53,7 +53,9 @@ static int ntstatus2errcode(NTSTATUS status) {
  * declare them here. Using these APIs also means we must link to
  * ntdll.dll, which is not linked by default in user code. */
 #pragma comment(lib, "ntdll.lib")
+#ifdef MDBX_AVOID_CRT
 #pragma comment(lib, "mdbx_ntdll_extra.lib")
+#endif
 
 extern NTSTATUS NTAPI NtCreateSection(
     OUT PHANDLE SectionHandle, IN ACCESS_MASK DesiredAccess,
diff --git a/src/osal.h b/src/osal.h
index 414bf19d..7ac226c2 100644
--- a/src/osal.h
+++ b/src/osal.h
@@ -91,6 +91,7 @@ typedef struct {
 } mdbx_condmutex_t;
 typedef CRITICAL_SECTION mdbx_fastmutex_t;
 
+#ifdef MDBX_AVOID_CRT
 #ifndef mdbx_malloc
 static inline void *mdbx_malloc(size_t bytes) {
   return LocalAlloc(LMEM_FIXED, bytes);
@@ -112,6 +113,13 @@ static inline void *mdbx_realloc(void *ptr, size_t bytes) {
 #ifndef mdbx_free
 #define mdbx_free LocalFree
 #endif /* mdbx_free */
+#else
+#define mdbx_malloc malloc
+#define mdbx_calloc calloc
+#define mdbx_realloc realloc
+#define mdbx_free free
+#define mdbx_strdup _strdup
+#endif /* MDBX_AVOID_CRT */
 
 #ifndef snprintf
 #define snprintf _snprintf /* ntdll */