diff --git a/src/libsystemd/meson.build b/src/libsystemd/meson.build
index 8a03890d8b..c3eef87b84 100644
--- a/src/libsystemd/meson.build
+++ b/src/libsystemd/meson.build
@@ -222,7 +222,8 @@ tests += [
           libglib,
           libgobject,
           libgio,
-          libdbus]],
+          libdbus,
+          libm]],
 
         [files('sd-bus/test-bus-signature.c'),
          [],
diff --git a/src/test/meson.build b/src/test/meson.build
index 74da544a46..d9304d538b 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -211,7 +211,9 @@ tests += [
 
         [files('test-mkdir.c')],
 
-        [files('test-json.c')],
+        [files('test-json.c'),
+         [],
+         [libm]],
 
         [files('test-modhex.c')],
 
@@ -275,7 +277,9 @@ tests += [
 
         [files('test-parse-helpers.c')],
 
-        [files('test-parse-util.c')],
+        [files('test-parse-util.c'),
+         [],
+         [libm]],
 
         [files('test-sysctl-util.c')],