diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 0fb31f5..0a7b2b8 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2361,7 +2361,7 @@ get_last_attnums_walker(Node *node, LastAttnumInfo *info)
  * Compute additional information for EEOP_*_FETCHSOME ops.
  *
  * The goal is to determine whether a slot is 'fixed', that is, every
- * evaluation of the the expression will have the same type of slot, with an
+ * evaluation of the expression will have the same type of slot, with an
  * equivalent descriptor.
  */
 static void
diff --git a/src/include/c.h b/src/include/c.h
index 33c9518..0f89c02 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -1129,7 +1129,7 @@ typedef union PGAlignedXLogBlock
  * Please note IT IS NOT SAFE to cast constness away if the result will ever
  * be modified (it would be undefined behaviour). Doing so anyway can cause
  * compiler misoptimizations or runtime crashes (modifying readonly memory).
- * It is only safe to use when the the result will not be modified, but API
+ * It is only safe to use when the result will not be modified, but API
  * design or language restrictions prevent you from declaring that
  * (e.g. because a function returns both const and non-const variables).
  *
diff --git a/src/include/jit/llvmjit_emit.h b/src/include/jit/llvmjit_emit.h
index 9569da6..71a8625 100644
--- a/src/include/jit/llvmjit_emit.h
+++ b/src/include/jit/llvmjit_emit.h
@@ -218,7 +218,7 @@ l_mcxt_switch(LLVMModuleRef mod, LLVMBuilderRef b, LLVMValueRef nc)
 }
 
 /*
- * Return pointer to the the argno'th argument nullness.
+ * Return pointer to the argno'th argument nullness.
  */
 static inline LLVMValueRef
 l_funcnullp(LLVMBuilderRef b, LLVMValueRef v_fcinfo, size_t argno)
@@ -236,7 +236,7 @@ l_funcnullp(LLVMBuilderRef b, LLVMValueRef v_fcinfo, size_t argno)
 }
 
 /*
- * Return pointer to the the argno'th argument datum.
+ * Return pointer to the argno'th argument datum.
  */
 static inline LLVMValueRef
 l_funcvaluep(LLVMBuilderRef b, LLVMValueRef v_fcinfo, size_t argno)
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index ff33287..4b1635e 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -593,7 +593,7 @@ typedef struct EState
 	 * and with which options.  es_jit is created on-demand when JITing is
 	 * performed.
 	 *
-	 * es_jit_combined_instr is the the combined, on demand allocated,
+	 * es_jit_combined_instr is the combined, on demand allocated,
 	 * instrumentation from all workers. The leader's instrumentation is kept
 	 * separate, and is combined on demand by ExplainPrintJITSummary().
 	 */
diff --git a/src/include/replication/logical.h b/src/include/replication/logical.h
index 0a2a63a..0daa38c 100644
--- a/src/include/replication/logical.h
+++ b/src/include/replication/logical.h
@@ -47,7 +47,7 @@ typedef struct LogicalDecodingContext
 
 	/*
 	 * Marks the logical decoding context as fast forward decoding one. Such a
-	 * context does not have plugin loaded so most of the the following
+	 * context does not have plugin loaded so most of the following
 	 * properties are unused.
 	 */
 	bool		fast_forward;