diff --git a/src/fragglescript/t_func.cpp b/src/fragglescript/t_func.cpp
index 8be7f798d6..e30c763261 100644
--- a/src/fragglescript/t_func.cpp
+++ b/src/fragglescript/t_func.cpp
@@ -68,6 +68,7 @@
 #include "r_data/colormaps.h"
 #include "farchive.h"
 #include "p_setup.h"
+#include "p_spec.h"
 
 static FRandom pr_script("FScript");
 
diff --git a/src/g_shared/a_decals.cpp b/src/g_shared/a_decals.cpp
index 64921d647a..ebefcdff0b 100644
--- a/src/g_shared/a_decals.cpp
+++ b/src/g_shared/a_decals.cpp
@@ -45,6 +45,7 @@
 #include "colormatcher.h"
 #include "v_palette.h"
 #include "farchive.h"
+#include "doomdata.h"
 
 static fixed_t DecalWidth, DecalLeft, DecalRight;
 static fixed_t SpreadZ;
diff --git a/src/g_strife/a_strifestuff.cpp b/src/g_strife/a_strifestuff.cpp
index fc11ba4334..724deaee23 100644
--- a/src/g_strife/a_strifestuff.cpp
+++ b/src/g_strife/a_strifestuff.cpp
@@ -19,6 +19,7 @@
 #include "d_event.h"
 #include "v_font.h"
 #include "farchive.h"
+#include "p_spec.h"
 
 // Include all the other Strife stuff here to reduce compile time
 #include "a_acolyte.cpp"
diff --git a/src/p_buildmap.cpp b/src/p_buildmap.cpp
index 6705addd6b..116c9ff6d9 100644
--- a/src/p_buildmap.cpp
+++ b/src/p_buildmap.cpp
@@ -18,6 +18,7 @@
 #include "r_data/colormaps.h"
 #include "gi.h"
 #include "portal.h"
+#include "p_spec.h"
 
 // MACROS ------------------------------------------------------------------
 
diff --git a/src/p_ceiling.cpp b/src/p_ceiling.cpp
index 24ab121c41..bd75fbee2a 100644
--- a/src/p_ceiling.cpp
+++ b/src/p_ceiling.cpp
@@ -30,6 +30,7 @@
 #include "r_state.h"
 #include "gi.h"
 #include "farchive.h"
+#include "p_spec.h"
 
 //============================================================================
 //
diff --git a/src/p_floor.cpp b/src/p_floor.cpp
index 2a29264606..d91c051705 100644
--- a/src/p_floor.cpp
+++ b/src/p_floor.cpp
@@ -31,6 +31,7 @@
 #include "tables.h"
 #include "farchive.h"
 #include "p_3dmidtex.h"
+#include "p_spec.h"
 #include "r_data/r_interpolate.h"
 
 //==========================================================================
diff --git a/src/p_linkedsectors.cpp b/src/p_linkedsectors.cpp
index b9ef8b1007..f1e199b2f7 100644
--- a/src/p_linkedsectors.cpp
+++ b/src/p_linkedsectors.cpp
@@ -36,6 +36,7 @@
 #include "templates.h"
 #include "p_local.h"
 #include "p_lnspec.h"
+#include "p_spec.h"
 
 enum
 {
diff --git a/src/p_plats.cpp b/src/p_plats.cpp
index b0697fc34b..83d7e101dd 100644
--- a/src/p_plats.cpp
+++ b/src/p_plats.cpp
@@ -31,6 +31,7 @@
 #include "r_state.h"
 #include "gi.h"
 #include "farchive.h"
+#include "p_spec.h"
 
 static FRandom pr_doplat ("DoPlat");