diff --git a/blas/CMakeLists.txt b/blas/CMakeLists.txt
index 4f189925a..8842b30b7 100644
--- a/blas/CMakeLists.txt
+++ b/blas/CMakeLists.txt
@@ -15,7 +15,7 @@ set(EigenBlas_SRCS  single.cpp double.cpp complex_single.cpp complex_double.cpp
 
 set(EIGEN_BLAS_TARGETS "")
 
-add_library(eigen_blas_static ${EigenBlas_SRCS})
+add_library(eigen_blas_static STATIC ${EigenBlas_SRCS})
 list(APPEND EIGEN_BLAS_TARGETS eigen_blas_static)
 
 if (EIGEN_BUILD_SHARED_LIBS)
diff --git a/lapack/CMakeLists.txt b/lapack/CMakeLists.txt
index e61c99b2c..b0b5570e2 100644
--- a/lapack/CMakeLists.txt
+++ b/lapack/CMakeLists.txt
@@ -97,7 +97,7 @@ endif()
 
 set(EIGEN_LAPACK_TARGETS "")
 
-add_library(eigen_lapack_static ${EigenLapack_SRCS} ${ReferenceLapack_SRCS})
+add_library(eigen_lapack_static STATIC ${EigenLapack_SRCS} ${ReferenceLapack_SRCS})
 list(APPEND EIGEN_LAPACK_TARGETS eigen_lapack_static)
 
 if (EIGEN_BUILD_SHARED_LIBS)