diff --git a/src/gpl/src/solver.cpp b/src/gpl/src/solver.cpp
index 78a0e3530ca..57e3d2731ab 100644
--- a/src/gpl/src/solver.cpp
+++ b/src/gpl/src/solver.cpp
@@ -35,6 +35,8 @@
 
 #include "solver.h"
 
+#include <omp.h>
+
 namespace gpl {
 
 ResidualError cpuSparseSolve(int maxSolverIter,