diff --git a/CMakeLists.txt b/CMakeLists.txt
index 599bb1d591..5922eb4e58 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,7 +54,7 @@ set ( JF_LIB_SRCS  src/json_kinds.F90
                    src/json_value_module.F90
                    src/json_file_module.F90
                    src/json_module.F90 )
-file ( GLOB JF_TEST_SRCS "src/tests/jf_test_*.f90" )
+file ( GLOB JF_TEST_SRCS "src/tests/jf_test_*.F90" )
 set ( JF_TEST_UCS4_SUPPORT_SRC "${CMAKE_SOURCE_DIR}/src/tests/introspection/test_iso_10646_support.f90")
 
 #-----------------------------------------
diff --git a/src/tests/jf_test_1.f90 b/src/tests/jf_test_1.F90
similarity index 100%
rename from src/tests/jf_test_1.f90
rename to src/tests/jf_test_1.F90
diff --git a/src/tests/jf_test_10.f90 b/src/tests/jf_test_10.F90
similarity index 100%
rename from src/tests/jf_test_10.f90
rename to src/tests/jf_test_10.F90
diff --git a/src/tests/jf_test_12.f90 b/src/tests/jf_test_12.F90
similarity index 100%
rename from src/tests/jf_test_12.f90
rename to src/tests/jf_test_12.F90
diff --git a/src/tests/jf_test_13.f90 b/src/tests/jf_test_13.F90
similarity index 100%
rename from src/tests/jf_test_13.f90
rename to src/tests/jf_test_13.F90
diff --git a/src/tests/jf_test_14.f90 b/src/tests/jf_test_14.F90
similarity index 100%
rename from src/tests/jf_test_14.f90
rename to src/tests/jf_test_14.F90
diff --git a/src/tests/jf_test_15.f90 b/src/tests/jf_test_15.F90
similarity index 100%
rename from src/tests/jf_test_15.f90
rename to src/tests/jf_test_15.F90
diff --git a/src/tests/jf_test_16.f90 b/src/tests/jf_test_16.F90
similarity index 100%
rename from src/tests/jf_test_16.f90
rename to src/tests/jf_test_16.F90
diff --git a/src/tests/jf_test_17.f90 b/src/tests/jf_test_17.F90
similarity index 100%
rename from src/tests/jf_test_17.f90
rename to src/tests/jf_test_17.F90
diff --git a/src/tests/jf_test_18.f90 b/src/tests/jf_test_18.F90
similarity index 100%
rename from src/tests/jf_test_18.f90
rename to src/tests/jf_test_18.F90
diff --git a/src/tests/jf_test_19.f90 b/src/tests/jf_test_19.F90
similarity index 100%
rename from src/tests/jf_test_19.f90
rename to src/tests/jf_test_19.F90
diff --git a/src/tests/jf_test_2.f90 b/src/tests/jf_test_2.F90
similarity index 100%
rename from src/tests/jf_test_2.f90
rename to src/tests/jf_test_2.F90
diff --git a/src/tests/jf_test_20.f90 b/src/tests/jf_test_20.F90
similarity index 100%
rename from src/tests/jf_test_20.f90
rename to src/tests/jf_test_20.F90
diff --git a/src/tests/jf_test_21.f90 b/src/tests/jf_test_21.F90
similarity index 100%
rename from src/tests/jf_test_21.f90
rename to src/tests/jf_test_21.F90
diff --git a/src/tests/jf_test_22.f90 b/src/tests/jf_test_22.F90
similarity index 100%
rename from src/tests/jf_test_22.f90
rename to src/tests/jf_test_22.F90
diff --git a/src/tests/jf_test_23.f90 b/src/tests/jf_test_23.F90
similarity index 100%
rename from src/tests/jf_test_23.f90
rename to src/tests/jf_test_23.F90
diff --git a/src/tests/jf_test_26.f90 b/src/tests/jf_test_26.F90
similarity index 100%
rename from src/tests/jf_test_26.f90
rename to src/tests/jf_test_26.F90
diff --git a/src/tests/jf_test_27.f90 b/src/tests/jf_test_27.F90
similarity index 100%
rename from src/tests/jf_test_27.f90
rename to src/tests/jf_test_27.F90
diff --git a/src/tests/jf_test_28.f90 b/src/tests/jf_test_28.F90
similarity index 100%
rename from src/tests/jf_test_28.f90
rename to src/tests/jf_test_28.F90
diff --git a/src/tests/jf_test_29.f90 b/src/tests/jf_test_29.F90
similarity index 100%
rename from src/tests/jf_test_29.f90
rename to src/tests/jf_test_29.F90
diff --git a/src/tests/jf_test_3.f90 b/src/tests/jf_test_3.F90
similarity index 100%
rename from src/tests/jf_test_3.f90
rename to src/tests/jf_test_3.F90
diff --git a/src/tests/jf_test_30.f90 b/src/tests/jf_test_30.F90
similarity index 100%
rename from src/tests/jf_test_30.f90
rename to src/tests/jf_test_30.F90
diff --git a/src/tests/jf_test_4.f90 b/src/tests/jf_test_4.F90
similarity index 100%
rename from src/tests/jf_test_4.f90
rename to src/tests/jf_test_4.F90
diff --git a/src/tests/jf_test_5.f90 b/src/tests/jf_test_5.F90
similarity index 100%
rename from src/tests/jf_test_5.f90
rename to src/tests/jf_test_5.F90
diff --git a/src/tests/jf_test_6.f90 b/src/tests/jf_test_6.F90
similarity index 100%
rename from src/tests/jf_test_6.f90
rename to src/tests/jf_test_6.F90
diff --git a/src/tests/jf_test_7.f90 b/src/tests/jf_test_7.F90
similarity index 100%
rename from src/tests/jf_test_7.f90
rename to src/tests/jf_test_7.F90
diff --git a/src/tests/jf_test_8.f90 b/src/tests/jf_test_8.F90
similarity index 100%
rename from src/tests/jf_test_8.f90
rename to src/tests/jf_test_8.F90
diff --git a/src/tests/jf_test_9.f90 b/src/tests/jf_test_9.F90
similarity index 100%
rename from src/tests/jf_test_9.f90
rename to src/tests/jf_test_9.F90