diff --git a/include/SpectralEvaluation/Fit/ParameterVector.h b/include/SpectralEvaluation/Fit/ParameterVector.h
index 9cc1f1c..5251c0d 100644
--- a/include/SpectralEvaluation/Fit/ParameterVector.h
+++ b/include/SpectralEvaluation/Fit/ParameterVector.h
@@ -7,6 +7,7 @@
 #if !defined(PARAMETERVECTOR_H_20020209)
 #define PARAMETERVECTOR_H_20020209
 
+#include <assert.h>
 #include <SpectralEvaluation/Fit/Vector.h>
 #include <SpectralEvaluation/Fit/Matrix.h>
 #include <SpectralEvaluation/Fit/ParameterLinkItem.h>