diff --git a/libc/src/math/cosf.cpp b/libc/src/math/cosf.cpp
--- a/libc/src/math/cosf.cpp
+++ b/libc/src/math/cosf.cpp
@@ -9,8 +9,8 @@
 #include "math_utils.h"
 #include "sincosf_utils.h"
 
-#include "include/math.h"
 #include "src/__support/common.h"
+#include <math.h>
 
 #include <stdint.h>
 
diff --git a/libc/src/math/exp2f.cpp b/libc/src/math/exp2f.cpp
--- a/libc/src/math/exp2f.cpp
+++ b/libc/src/math/exp2f.cpp
@@ -9,8 +9,8 @@
 #include "exp_utils.h"
 #include "math_utils.h"
 
-#include "include/math.h"
 #include "src/__support/common.h"
+#include <math.h>
 
 #include <stdint.h>
 
diff --git a/libc/src/math/expf.cpp b/libc/src/math/expf.cpp
--- a/libc/src/math/expf.cpp
+++ b/libc/src/math/expf.cpp
@@ -9,8 +9,8 @@
 #include "exp_utils.h"
 #include "math_utils.h"
 
-#include "include/math.h"
 #include "src/__support/common.h"
+#include <math.h>
 
 #include <stdint.h>
 
diff --git a/libc/src/math/math_utils.h b/libc/src/math/math_utils.h
--- a/libc/src/math/math_utils.h
+++ b/libc/src/math/math_utils.h
@@ -9,11 +9,11 @@
 #ifndef LLVM_LIBC_SRC_MATH_MATH_UTILS_H
 #define LLVM_LIBC_SRC_MATH_MATH_UTILS_H
 
-#include "include/errno.h"
-#include "include/math.h"
 #include "src/__support/common.h"
 #include "src/errno/llvmlibc_errno.h"
 #include "utils/CPP/TypeTraits.h"
+#include <errno.h>
+#include <math.h>
 
 #include <stdint.h>
 
diff --git a/libc/src/math/sincosf.cpp b/libc/src/math/sincosf.cpp
--- a/libc/src/math/sincosf.cpp
+++ b/libc/src/math/sincosf.cpp
@@ -9,8 +9,8 @@
 #include "math_utils.h"
 #include "sincosf_utils.h"
 
-#include "include/math.h"
 #include "src/__support/common.h"
+#include <math.h>
 
 #include <stdint.h>
 
diff --git a/libc/src/math/sinf.cpp b/libc/src/math/sinf.cpp
--- a/libc/src/math/sinf.cpp
+++ b/libc/src/math/sinf.cpp
@@ -9,8 +9,8 @@
 #include "math_utils.h"
 #include "sincosf_utils.h"
 
-#include "include/math.h"
 #include "src/__support/common.h"
+#include <math.h>
 
 #include <stdint.h>
 
diff --git a/libc/src/string/strcat.h b/libc/src/string/strcat.h
--- a/libc/src/string/strcat.h
+++ b/libc/src/string/strcat.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SRC_STRING_STRCAT_H
 #define LLVM_LIBC_SRC_STRING_STRCAT_H
 
-#include "include/string.h"
+#include <string.h>
 
 namespace __llvm_libc {
 
diff --git a/libc/src/string/strcpy.h b/libc/src/string/strcpy.h
--- a/libc/src/string/strcpy.h
+++ b/libc/src/string/strcpy.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SRC_STRING_STRCPY_H
 #define LLVM_LIBC_SRC_STRING_STRCPY_H
 
-#include "include/string.h"
+#include <string.h>
 
 namespace __llvm_libc {
 
diff --git a/libc/src/string/strlen.h b/libc/src/string/strlen.h
--- a/libc/src/string/strlen.h
+++ b/libc/src/string/strlen.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SRC_STRING_STRLEN_H
 #define LLVM_LIBC_SRC_STRING_STRLEN_H
 
-#include "include/string.h"
+#include <string.h>
 
 namespace __llvm_libc {