diff --git a/ksw2_extd2_sse.c b/ksw2_extd2_sse.c
index e8bee8ea..162e9e26 100644
--- a/ksw2_extd2_sse.c
+++ b/ksw2_extd2_sse.c
@@ -4,10 +4,10 @@
 #include "ksw2.h"
 
 #ifdef __SSE2__
-#ifndef USE_SIMDE
-#include <emmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse2.h>
+#else
+#include <emmintrin.h>
 #endif
 
 #ifdef KSW_SSE2_ONLY
@@ -15,10 +15,10 @@
 #endif
 
 #ifdef __SSE4_1__
-#ifndef USE_SIMDE
-#include <smmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse4.1.h>
+#else
+#include <smmintrin.h>
 #endif
 #endif
 
diff --git a/ksw2_exts2_sse.c b/ksw2_exts2_sse.c
index 1eb95029..4157e382 100644
--- a/ksw2_exts2_sse.c
+++ b/ksw2_exts2_sse.c
@@ -4,20 +4,20 @@
 #include "ksw2.h"
 
 #ifdef __SSE2__
-#ifndef USE_SIMDE
-#include <emmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse2.h>
+#else
+#include <emmintrin.h>
 #endif
 #ifdef KSW_SSE2_ONLY
 #undef __SSE4_1__
 #endif
 
 #ifdef __SSE4_1__
-#ifndef USE_SIMDE
-#include <smmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse4.1.h>
+#else
+#include <smmintrin.h>
 #endif
 #endif
 
diff --git a/ksw2_extz2_sse.c b/ksw2_extz2_sse.c
index bcdf32fa..ad191314 100644
--- a/ksw2_extz2_sse.c
+++ b/ksw2_extz2_sse.c
@@ -3,10 +3,10 @@
 #include "ksw2.h"
 
 #ifdef __SSE2__
-#ifndef USE_SIMDE
-#include <emmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse2.h>
+#else
+#include <emmintrin.h>
 #endif
 
 #ifdef KSW_SSE2_ONLY
@@ -14,10 +14,10 @@
 #endif
 
 #ifdef __SSE4_1__
-#ifndef USE_SIMDE
-#include <smmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse4.1.h>
+#else
+#include <smmintrin.h>
 #endif
 #endif
 
diff --git a/ksw2_ll_sse.c b/ksw2_ll_sse.c
index 8cef46c5..14b9b50a 100644
--- a/ksw2_ll_sse.c
+++ b/ksw2_ll_sse.c
@@ -3,10 +3,10 @@
 #include <string.h>
 #include "ksw2.h"
 
-#ifndef USE_SIMDE
-#include <emmintrin.h>
-#else
+#ifdef USE_SIMDE
 #include <simde/x86/sse2.h>
+#else
+#include <emmintrin.h>
 #endif
 
 #ifdef __GNUC__