diff --git a/src/external/structuresynth-1.5/structuresynth.pro b/src/external/structuresynth-1.5/structuresynth.pro
index b946f88b..a019ba48 100644
--- a/src/external/structuresynth-1.5/structuresynth.pro
+++ b/src/external/structuresynth-1.5/structuresynth.pro
@@ -2,6 +2,8 @@ TEMPLATE = lib
 TARGET = ssynth
 CONFIG += staticlib
 
+QMAKE_CXXFLAGS+=-fopenmp
+
 DEPENDPATH += . \
               ssynth \
               ssynth/StructureSynth/Model \
diff --git a/src/meshlabplugins/filter_ssynth/filter_ssynth.pro b/src/meshlabplugins/filter_ssynth/filter_ssynth.pro
index 5ab0cd36..dd5506a7 100644
--- a/src/meshlabplugins/filter_ssynth/filter_ssynth.pro
+++ b/src/meshlabplugins/filter_ssynth/filter_ssynth.pro
@@ -18,6 +18,8 @@ win32-msvc2012:LIBS += ../../external/lib/win32-msvc2012/ssynth.lib
 win32-msvc2015:LIBS += ../../external/lib/win32-msvc2015/ssynth.lib
 win32-g++:LIBS += ../../external/lib/win32-gcc/libssynth.a
 linux-g++:LIBS += ../../external/lib/linux-g++/libssynth.a
+linux-g++:LIBS += -lgomp
+QMAKE_CXXFLAGS+=-fopenmp
 macx:LIBS += ../../external/lib/macx64/libssynth.a
 TARGET = filter_ssynth
 TEMPLATE = lib