diff --git a/CMakeLists.txt b/CMakeLists.txt
index 773b623..c61a1e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,10 @@ include(FindPkgConfig)
 find_package(RT REQUIRED)
 find_package(M REQUIRED)
 
-pkg_check_modules(IGRAPH REQUIRED igraph)
+# We don't yet support igraph 0.10.0+, which has some API changes.
+# See https://github.com/shadow/tgen/issues/44
+pkg_check_modules(IGRAPH REQUIRED igraph<0.10.0)
+
 pkg_check_modules(GLIB REQUIRED glib-2.0)
 
 ## Parse out igraph version. Needed to work around breaking API changes in igraph.