diff --git a/include/perfetto/tracing/track_event_category_registry.h b/include/perfetto/tracing/track_event_category_registry.h
index 5e5304d..e51c4d6 100644
--- a/include/perfetto/tracing/track_event_category_registry.h
+++ b/include/perfetto/tracing/track_event_category_registry.h
@@ -282,7 +282,7 @@
   }
 
   static constexpr bool IsValidCategoryName(const char* name) {
-    return (!name || *name == '\"' || *name == '*')
+    return (!name || *name == '\"' || *name == '*' || *name == ' ')
                ? false
                : *name ? IsValidCategoryName(name + 1) : true;
   }
diff --git a/src/tracing/test/api_integrationtest.cc b/src/tracing/test/api_integrationtest.cc
index be24f71..08bd8a3 100644
--- a/src/tracing/test/api_integrationtest.cc
+++ b/src/tracing/test/api_integrationtest.cc
@@ -98,7 +98,6 @@
     perfetto::Category("cat").SetTags("slow"),
     perfetto::Category("cat.verbose").SetTags("debug"),
     perfetto::Category("cat-with-dashes"),
-    perfetto::Category("cat with spaces"),
     perfetto::Category::Group("foo,bar"),
     perfetto::Category::Group("baz,bar,quux"),
     perfetto::Category::Group("red,green,blue,foo"),
@@ -990,7 +989,7 @@
 
   // Check that the advertised categories match PERFETTO_DEFINE_CATEGORIES (see
   // above).
-  EXPECT_EQ(8, desc.available_categories_size());
+  EXPECT_EQ(7, desc.available_categories_size());
   EXPECT_EQ("test", desc.available_categories()[0].name());
   EXPECT_EQ("This is a test category",
             desc.available_categories()[0].description());
@@ -1002,9 +1001,8 @@
   EXPECT_EQ("cat.verbose", desc.available_categories()[4].name());
   EXPECT_EQ("debug", desc.available_categories()[4].tags()[0]);
   EXPECT_EQ("cat-with-dashes", desc.available_categories()[5].name());
-  EXPECT_EQ("cat with spaces", desc.available_categories()[6].name());
-  EXPECT_EQ("disabled-by-default-cat", desc.available_categories()[7].name());
-  EXPECT_EQ("slow", desc.available_categories()[7].tags()[0]);
+  EXPECT_EQ("disabled-by-default-cat", desc.available_categories()[6].name());
+  EXPECT_EQ("slow", desc.available_categories()[6].tags()[0]);
 }
 
 TEST_P(PerfettoApiTest, TrackEventSharedIncrementalState) {
@@ -3028,10 +3026,8 @@
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("dynamic"));
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("dynamic_2"));
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED(dynamic));
-  EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("cat with spaces"));
 
-  auto* tracing_session =
-      NewTraceWithCategories({"foo", "dynamic", "cat with spaces"});
+  auto* tracing_session = NewTraceWithCategories({"foo", "dynamic"});
   tracing_session->get()->StartBlocking();
   EXPECT_TRUE(TRACE_EVENT_CATEGORY_ENABLED("foo"));
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("bar"));
@@ -3039,7 +3035,6 @@
   EXPECT_TRUE(TRACE_EVENT_CATEGORY_ENABLED("dynamic"));
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("dynamic_2"));
   EXPECT_TRUE(TRACE_EVENT_CATEGORY_ENABLED(dynamic));
-  EXPECT_TRUE(TRACE_EVENT_CATEGORY_ENABLED("cat with spaces"));
 
   tracing_session->get()->StopBlocking();
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("foo"));
@@ -3048,7 +3043,6 @@
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("dynamic"));
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("dynamic_2"));
   EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED(dynamic));
-  EXPECT_FALSE(TRACE_EVENT_CATEGORY_ENABLED("cat with spaces"));
 }
 
 class TestInterceptor : public perfetto::Interceptor<TestInterceptor> {