diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f6a910..3c7f9fa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,6 +92,15 @@ add_custom_command(
 file(RELATIVE_PATH DOXYGEN_BUILD_DIR_RELATIVE "${SOURCE_DOCS_DIR}" "${DOXYGEN_BUILD_DIR_CMAKE}")
 message(STATUS "DOXYGEN_BUILD_DIR_RELATIVE: ${DOXYGEN_BUILD_DIR_RELATIVE}")
 
+if(CMAKE_HOST_WIN32)
+    # On Windows, we have to build the documentation using only a single thread to
+    # avoid the build mysteriously taking forever.
+    # See https://github.com/doxygen/doxygen/issues/9694
+    set(DOXYGEN_NUM_THREADS 1)
+else()
+    set(DOXYGEN_NUM_THREADS 0)
+endif()
+
 # build docs
 add_custom_target(docs ALL
         COMMENT "Building Doxygen documentation"
@@ -99,6 +108,7 @@ add_custom_target(docs ALL
         COMMAND ${CMAKE_COMMAND} -E env
             READTHEDOCS_OUTPUT=${DOXYGEN_BUILD_DIR_RELATIVE}
             READTHEDOCS_VERSION=${DOXYGEN_PROJECT_VERSION}
+            DOXYCONFIG_THREADS=${DOXYGEN_NUM_THREADS}
             ${DOXYGEN_EXECUTABLE} doxyconfig-Doxyfile
         VERBATIM
         DEPENDS FONT_AWESOME_FILES
diff --git a/doxyconfig-Doxyfile b/doxyconfig-Doxyfile
index 9978cc5..dcf8f76 100644
--- a/doxyconfig-Doxyfile
+++ b/doxyconfig-Doxyfile
@@ -107,7 +107,6 @@ DISABLE_INDEX = NO
 DOCBOOK_OUTPUT = docbook
 DOT_GRAPH_MAX_NODES = 50
 DOT_IMAGE_FORMAT = svg
-DOT_NUM_THREADS = 1
 EXTRACT_ALL = NO
 FULL_SIDEBAR = NO
 GENERATE_HTML = YES
@@ -122,7 +121,11 @@ MACRO_EXPANSION = YES
 MAN_OUTPUT = man
 MARKDOWN_ID_STYLE = GITHUB
 MARKDOWN_SUPPORT = YES
-NUM_PROC_THREADS = 1
+# If DOXYCONFIG_THREADS is not set in the environment, both DOT_NUM_THREADS and
+# NUM_PROC_THREADS will be set to blank. A blank value for either is equivalent
+# to the value of 0, i.e., multithreading will be used.
+DOT_NUM_THREADS = $(DOXYCONFIG_THREADS)
+NUM_PROC_THREADS = $(DOXYCONFIG_THREADS)
 PROJECT_NUMBER = $(READTHEDOCS_VERSION)
 OUTPUT_DIRECTORY = $(READTHEDOCS_OUTPUT)
 RECURSIVE = YES