diff --git a/src/api/tesseractmain.cpp b/src/api/tesseractmain.cpp
index 93584231cd..efb8c5aaa7 100644
--- a/src/api/tesseractmain.cpp
+++ b/src/api/tesseractmain.cpp
@@ -108,13 +108,13 @@ static void PrintVersionInfo() {
         }
       }
     }
-    }
+  }
 #endif
-    if (SIMDDetect::IsAVX512BWAvailable()) printf(" Found AVX512BW\n");
-    if (SIMDDetect::IsAVX512FAvailable()) printf(" Found AVX512F\n");
-    if (SIMDDetect::IsAVX2Available()) printf(" Found AVX2\n");
-    if (SIMDDetect::IsAVXAvailable()) printf(" Found AVX\n");
-    if (SIMDDetect::IsSSEAvailable()) printf(" Found SSE\n");
+  if (tesseract::SIMDDetect::IsAVX512BWAvailable()) printf(" Found AVX512BW\n");
+  if (tesseract::SIMDDetect::IsAVX512FAvailable()) printf(" Found AVX512F\n");
+  if (tesseract::SIMDDetect::IsAVX2Available()) printf(" Found AVX2\n");
+  if (tesseract::SIMDDetect::IsAVXAvailable()) printf(" Found AVX\n");
+  if (tesseract::SIMDDetect::IsSSEAvailable()) printf(" Found SSE\n");
 }
 
 static void PrintHelpForPSM() {
@@ -706,4 +706,3 @@ int main(int argc, char** argv) {
 
   return EXIT_SUCCESS;
 }
-
diff --git a/src/arch/simddetect.cpp b/src/arch/simddetect.cpp
index 3a3990a5bd..09f742f262 100644
--- a/src/arch/simddetect.cpp
+++ b/src/arch/simddetect.cpp
@@ -19,19 +19,21 @@
 
 #undef X86_BUILD
 #if defined(__x86_64__) || defined(__i386__) || defined(_WIN32)
-#if !defined(ANDROID_BUILD)
-#define X86_BUILD 1
-#endif  // !ANDROID_BUILD
-#endif  // x86 target
+#  if !defined(ANDROID_BUILD)
+#    define X86_BUILD 1
+#  endif  // !ANDROID_BUILD
+#endif    // x86 target
 
 #if defined(X86_BUILD)
-#if defined(__GNUC__)
-#include <cpuid.h>
-#elif defined(_WIN32)
-#include <intrin.h>
-#endif
+#  if defined(__GNUC__)
+#    include <cpuid.h>
+#  elif defined(_WIN32)
+#    include <intrin.h>
+#  endif
 #endif
 
+namespace tesseract {
+
 SIMDDetect SIMDDetect::detector;
 
 // If true, then AVX has been detected.
@@ -49,7 +51,7 @@ bool SIMDDetect::sse_available_;
 // clang.
 SIMDDetect::SIMDDetect() {
 #if defined(X86_BUILD)
-#if defined(__GNUC__)
+#  if defined(__GNUC__)
   unsigned int eax, ebx, ecx, edx;
   if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) != 0) {
     // Note that these tests all use hex because the older compilers don't have
@@ -66,7 +68,7 @@ SIMDDetect::SIMDDetect() {
       avx512BW_available_ = (ebx & 0x40000000) != 0;
     }
   }
-#elif defined(_WIN32)
+#  elif defined(_WIN32)
   int cpuInfo[4];
   __cpuid(cpuInfo, 0);
   if (cpuInfo[0] >= 1) {
@@ -74,8 +76,10 @@ SIMDDetect::SIMDDetect() {
     sse_available_ = (cpuInfo[2] & 0x00080000) != 0;
     avx_available_ = (cpuInfo[2] & 0x10000000) != 0;
   }
-#else
-#error "I don't know how to test for SIMD with this compiler"
-#endif
+#  else
+#    error "I don't know how to test for SIMD with this compiler"
+#  endif
 #endif  // X86_BUILD
 }
+
+}  // namespace tesseract
diff --git a/src/arch/simddetect.h b/src/arch/simddetect.h
index 26b6920c3a..efb631938a 100644
--- a/src/arch/simddetect.h
+++ b/src/arch/simddetect.h
@@ -19,6 +19,8 @@
 
 #include "platform.h"
 
+namespace tesseract {
+
 // Architecture detector. Add code here to detect any other architectures for
 // SIMD-based faster dot product functions. Intended to be a single static
 // object, but it does no real harm to have more than one.
@@ -55,4 +57,6 @@ class SIMDDetect {
   static TESS_API bool sse_available_;
 };
 
+}  // namespace tesseract
+
 #endif  // TESSERACT_ARCH_SIMDDETECT_H_