diff --git a/Toolchain/BuildClang.sh b/Toolchain/BuildClang.sh
index 0bfb581b08..d1271593ea 100755
--- a/Toolchain/BuildClang.sh
+++ b/Toolchain/BuildClang.sh
@@ -247,14 +247,20 @@ popd
 # === COPY HEADERS ===
 
 SRC_ROOT=$($REALPATH "$DIR"/..)
-FILES=$(find "$SRC_ROOT"/Kernel/API "$SRC_ROOT"/Userland/Libraries/LibC -name '*.h' -print)
-
+FILES=$(find \
+    "$SRC_ROOT"/Kernel/API \
+    "$SRC_ROOT"/Userland/Libraries/LibC \
+    "$SRC_ROOT"/Userland/Libraries/LibRegex/RegexDefs.h \
+    -name '*.h' -print)
 for arch in $ARCHS; do
     mkdir -p "$BUILD/${arch}clang"
     pushd "$BUILD/${arch}clang"
         mkdir -p Root/usr/include/
         for header in $FILES; do
-            target=$(echo "$header" | "$SED" -e "s|$SRC_ROOT/Userland/Libraries/LibC||" -e "s|$SRC_ROOT/Kernel/|Kernel/|")
+            target=$(echo "$header" | "$SED" \
+                -e "s|$SRC_ROOT/Userland/Libraries/LibC||" \
+                -e "s|$SRC_ROOT/Kernel/|Kernel/|" \
+                -e "s|$SRC_ROOT/Userland/Libraries/LibRegex/|LibRegex/|")
             buildstep "system_headers" "$INSTALL" -D "$header" "Root/usr/include/$target"
         done
     popd
diff --git a/Toolchain/BuildGNU.sh b/Toolchain/BuildGNU.sh
index 339a06ad3c..5a87e87682 100755
--- a/Toolchain/BuildGNU.sh
+++ b/Toolchain/BuildGNU.sh
@@ -270,12 +270,14 @@ pushd "$DIR/Build/$ARCH"
             "$SRC_ROOT"/Kernel/API \
             "$SRC_ROOT"/Kernel/Arch \
             "$SRC_ROOT"/Userland/Libraries/LibC \
+            "$SRC_ROOT"/Userland/Libraries/LibRegex/RegexDefs.h \
             -name '*.h' -print)
         for header in $FILES; do
             target=$(echo "$header" | sed \
                 -e "s|$SRC_ROOT/AK/|AK/|" \
                 -e "s|$SRC_ROOT/Userland/Libraries/LibC||" \
-                -e "s|$SRC_ROOT/Kernel/|Kernel/|")
+                -e "s|$SRC_ROOT/Kernel/|Kernel/|" \
+                -e "s|$SRC_ROOT/Userland/Libraries/LibRegex/|LibRegex/|")
             buildstep "system_headers" mkdir -p "$(dirname "Root/usr/include/$target")"
             buildstep "system_headers" $INSTALL "$header" "Root/usr/include/$target"
         done
diff --git a/Userland/Libraries/LibC/regex.h b/Userland/Libraries/LibC/regex.h
index 6d82d883ea..e408b52bb4 100644
--- a/Userland/Libraries/LibC/regex.h
+++ b/Userland/Libraries/LibC/regex.h
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include "bits/regex_defs.h"
+#include <LibRegex/RegexDefs.h>
 #include <stddef.h>
 #include <sys/cdefs.h>
 #include <sys/types.h>
diff --git a/Userland/Libraries/LibC/bits/regex_defs.h b/Userland/Libraries/LibRegex/RegexDefs.h
similarity index 100%
rename from Userland/Libraries/LibC/bits/regex_defs.h
rename to Userland/Libraries/LibRegex/RegexDefs.h
diff --git a/Userland/Libraries/LibRegex/RegexError.h b/Userland/Libraries/LibRegex/RegexError.h
index 27eeab5886..dc75683984 100644
--- a/Userland/Libraries/LibRegex/RegexError.h
+++ b/Userland/Libraries/LibRegex/RegexError.h
@@ -6,13 +6,9 @@
 
 #pragma once
 
+#include "RegexDefs.h"
 #include <AK/StringView.h>
 #include <AK/Types.h>
-#ifdef AK_OS_SERENITY
-#    include <bits/regex_defs.h>
-#else
-#    include <LibC/bits/regex_defs.h>
-#endif
 
 namespace regex {
 
diff --git a/Userland/Libraries/LibRegex/RegexOptions.h b/Userland/Libraries/LibRegex/RegexOptions.h
index d244de8ebf..94167e9136 100644
--- a/Userland/Libraries/LibRegex/RegexOptions.h
+++ b/Userland/Libraries/LibRegex/RegexOptions.h
@@ -6,13 +6,9 @@
 
 #pragma once
 
+#include "RegexDefs.h"
 #include <AK/Types.h>
 #include <stdio.h>
-#ifdef AK_OS_SERENITY
-#    include <bits/regex_defs.h>
-#else
-#    include <LibC/bits/regex_defs.h>
-#endif
 
 namespace regex {