diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 1eb60a1b8..7c676829e 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -31,7 +31,6 @@
 #include <sstream>
 #include <cstring>
 #include <optional>
-#include <pthread.h>
 #include <unistd.h>
 #include <sys/time.h>
 #include <fstream>
@@ -48,6 +47,8 @@
 
 #define GC_INCLUDE_NEW
 
+#include <pthread.h>
+
 #include <gc/gc.h>
 #include <gc/gc_cpp.h>
 #include <gc/gc_allocator.h>